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+                url("https://cdn.kastatic.org/images/learn-menu/left-background.png"),
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+             !important;background-position:
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!important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;display:none !important;}@media screen and (max-width: 1023px) /* mediaQueries.mdOrSmaller */{._vd38ksx{display:block !important;}}._5uxlpg{-webkit-box-pack:justify !important;-ms-flex-pack:justify !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-justify-content:space-between !important;justify-content:space-between !important;margin-top:8px 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/* mediaQueries.mdOrLarger */{._ae3kwy7{-webkit-flex:1 0 50% !important;-ms-flex:1 0 50% !important;flex:1 0 50% !important;padding-right:40px !important;display:none !important;}}@media screen and (min-width: 1024px) /* mediaQueries.lgOrLarger */{._ae3kwy7{-webkit-flex:1 0 33% !important;-ms-flex:1 0 33% !important;flex:1 0 33% !important;padding-right:40px !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._ae3kwy7{-webkit-flex:1 0 100% !important;-ms-flex:1 0 100% !important;flex:1 0 100% !important;padding-right:0px !important;margin-left:-4px !important;margin-right:-4px !important;min-height:56px !important;height:56px !important;display:none !important;}}._wvjbru{-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-box-align:center !important;-ms-flex-align:center 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704px){._1b20dct{margin-right:0px !important;}}@media screen and (max-width: 1023px) /* mediaQueries.mdOrSmaller */{._1b20dct{margin-top:16px !important;margin-right:16px !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._1b20dct{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;width:100% !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-align-items:center !important;align-items:center !important;}}._zgoueth{-webkit-box-align:center !important;-ms-flex-align:center !important;cursor:pointer !important;outline:none !important;text-decoration:underline currentcolor solid !important;color:rgba(33,36,44,0.64) !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-align-items:center !important;align-items:center !important;}._11l3t46e{position:absolute !important;z-index:1000 !important;display:block !important;background-color:#f7f8fa !important;border-bottom:1px solid rgba(33,36,44,0.16) !important;border-top:1px solid rgba(33,36,44,0.16) !important;left:0px !important;opacity:0.99 !important;width:100% !important;}@media screen and (min-width: 1366px){._11l3t46e{background-image:
+                url("https://cdn.kastatic.org/images/learn-menu/left-background.png"),
+                url("https://cdn.kastatic.org/images/learn-menu/right-background.png")
+             !important;background-position:
+                center left,
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!important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;overflow:hidden !important;-webkit-justify-content:center !important;justify-content:center !important;background-color:#ffffff !important;padding:16px 24px 24px 16px !important;border-radius:4px !important;border:solid 1px rgba(33,36,44,0.16) !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._12yy6f6l{border-radius:0px !important;border-left:none !important;border-right:none 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!important;height:32px !important;position:relative !important;width:32px !important;}@media screen and (min-width: 568px) and (max-width: 767px) /* mediaQueries.sm */{._ad17k31{-webkit-flex:0 0 40px !important;-ms-flex:0 0 40px !important;flex:0 0 40px !important;height:40px !important;margin-right:16px !important;width:40px !important;}}._k50sd54{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;margin-top:0px !important;margin-bottom:0px !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:700 !important;font-size:16px !important;line-height:20px !important;}._1uaitk42{-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;padding-top:4px !important;}@media screen and (min-width: 568px) and (max-width: 767px) /* mediaQueries.sm */{._1uaitk42{-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-justify-content:center !important;justify-content:center !important;}}._1rbo3nd6{-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;-webkit-flex:1 !important;-ms-flex:1 !important;flex:1 !important;}._twomc80{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:400 !important;font-size:14px !important;line-height:18px !important;padding-top:12px !important;overflow:hidden !important;text-overflow:ellipsis !important;white-space:nowrap !important;width:100% !important;}._1iq2k2kb{-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;background-color:#f7f8fa !important;padding-bottom:48px !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._1iq2k2kb{padding-bottom:40px !important;}}._nypyycw{-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;padding-bottom:16px !important;background-color:null !important;}._194da0qz{-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;background-color:null !important;padding-bottom:48px !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._194da0qz{padding-bottom:40px !important;}}._ms01sy9{-moz-box-sizing:border-box !important;box-sizing:border-box !important;height:62px !important;left:0px !important;position:relative !important;right:0px !important;z-index:1060 !important;border-top:1px solid rgba(33,36,44,0.16) !important;border-bottom:1px solid rgba(33,36,44,0.16) !important;}@media print{._ms01sy9{background-color:#ffffff !important;}}@media screen and (min-width: 768px) /* mediaQueries.mdOrLarger */{._ms01sy9{position:-webkit-sticky !important;position:sticky !important;top:0px !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._ms01sy9{background:#f7f8fa !important;}}._1lzcqmvq{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-size:16px !important;line-height:20px !important;font-weight:700 !important;}._wqc4mpu{-webkit-box-lines:multiple !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-flex-wrap:wrap !important;-ms-flex-wrap:wrap !important;flex-wrap:wrap !important;gap:16px 0 !important;margin-top:8px !important;}._7thghm{-webkit-box-pack:start !important;-ms-flex-pack:start !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-justify-content:flex-start !important;justify-content:flex-start !important;margin:6px 0px 6px 0px !important;border:solid 1px rgba(33,36,44,0.16) !important;border-radius:4px !important;background-color:#ffffff !important;padding-right:16px !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._7thghm{margin-left:0px !important;margin-right:0px !important;margin-top:0px !important;border-radius:0px !important;padding-right:0px !important;}}@media screen and (max-width: 1199px) /* mediaQueries.lgOrSmaller */{._7thghm{-webkit-box-pack:end !important;-ms-flex-pack:end !important;-webkit-justify-content:flex-end !important;justify-content:flex-end !important;}}._17tckgal{-ms-flex-positive:1 !important;-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-justify-content:center !important;justify-content:center !important;-webkit-align-items:center !important;align-items:center !important;overflow:hidden !important;-webkit-flex:1 !important;-ms-flex:1 !important;flex:1 !important;-webkit-flex-grow:1 !important;flex-grow:1 !important;padding-top:24px !important;margin-right:16px !important;margin-left:32px !important;padding-bottom:22px !important;}@media screen and (max-width: 1199px) /* mediaQueries.lgOrSmaller */{._17tckgal{margin-left:32px !important;}}@media screen and (min-width: 1024px) /* mediaQueries.lgOrLarger */{._17tckgal{max-width:836px !important;}}@media screen and (min-width: 768px) and (max-width: 1023px) /* mediaQueries.md */{._17tckgal{max-width:702px !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._17tckgal{margin-left:0px !important;margin-right:0px !important;padding-left:16px !important;padding-right:16px !important;padding-top:22px !important;padding-bottom:22px !important;}}._vscsza{-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;-webkit-flex:1 !important;-ms-flex:1 !important;flex:1 !important;}._1xruehb{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;margin-top:0px !important;margin-bottom:0px !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:700 !important;color:#21242c !important;}@media (min-width: 1024px){._1xruehb{font-size:24px !important;line-height:28px 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(max-width: 767px) /* mediaQueries.smOrSmaller */{._v5zh60p{-ms-flex-order:1 !important;-webkit-order:1 !important;order:1 !important;}}._1q19l6p3{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:400 !important;font-size:16px !important;line-height:20px !important;color:rgba(33,36,44,0.64) !important;}._10ct3cvu{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;position:relative !important;-webkit-align-items:center !important;align-items:center !important;margin-bottom:1px 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*/{._1hee5o7j{padding-left:16px !important;height:auto !important;margin-left:0px !important;}}._11igkdh{line-height:22px !important;margin-bottom:0px !important;font-family:inherit !important;font-size:15px !important;}._1qwvhpzm{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-ms-flex-positive:1 !important;border:none !important;margin:0px !important;padding:0px !important;width:auto !important;overflow:visible !important;background:transparent !important;text-decoration:none !important;color:inherit !important;font:inherit !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;-ms-touch-action:manipulation !important;touch-action:manipulation !important;-webkit-user-select:none !important;-moz-user-select:none !important;-ms-user-select:none !important;user-select:none !important;outline:none !important;line-height:normal 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!important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-grow:1 !important;flex-grow:1 !important;-webkit-flex-direction:grow !important;-ms-flex-direction:grow !important;flex-direction:grow !important;-webkit-align-items:center !important;align-items:center !important;margin-top:0px !important;padding-left:0px !important;padding-right:0px !important;padding-top:7px !important;padding-bottom:7px !important;}._gl1g2rh:hover{text-decoration:underline !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._gl1g2rh{margin-top:0px !important;padding-left:0px !important;padding-right:0px !important;padding-top:7px !important;padding-bottom:7px !important;}}._14jg6rbg{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-ms-flex-positive:1 !important;border:none !important;margin:0px !important;padding:0px !important;width:auto !important;overflow:visible !important;background:transparent !important;text-decoration:none !important;color:inherit !important;font:inherit !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;-ms-touch-action:manipulation !important;touch-action:manipulation !important;-webkit-user-select:none !important;-moz-user-select:none !important;-ms-user-select:none !important;user-select:none !important;outline:none !important;line-height:normal !important;-webkit-font-smoothing:inherit !important;-moz-osx-font-smoothing:inherit !important;cursor:pointer !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-grow:1 !important;flex-grow:1 !important;-webkit-flex-direction:grow !important;-ms-flex-direction:grow !important;flex-direction:grow !important;-webkit-align-items:center !important;align-items:center !important;margin-top:0px !important;padding-left:0px !important;padding-bottom:0px !important;padding-right:0px !important;padding-top:7px !important;}._14jg6rbg:hover{text-decoration:underline !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._14jg6rbg{margin-top:0px !important;padding-left:0px !important;padding-bottom:0px !important;padding-right:0px !important;padding-top:7px !important;}}._a4dcxhc{-webkit-box-pack:justify !important;-ms-flex-pack:justify !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-width:0px !important;background:#f7f8fa !important;border-radius:4px !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-justify-content:space-between !important;justify-content:space-between !important;min-height:108px !important;cursor:pointer !important;margin-top:12px !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._a4dcxhc{margin-top:0px !important;padding-top:11px !important;padding-bottom:11px !important;margin-bottom:11px !important;}}._1odew2or{-webkit-box-pack:justify !important;-ms-flex-pack:justify !important;-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;margin:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;padding:12px 12px 14px !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;-webkit-justify-content:space-between !important;justify-content:space-between !important;}._pc9bder{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:700 !important;font-size:16px !important;line-height:20px !important;color:#21242c !important;}._4t1yfcf{-webkit-font-smoothing:antialiased !important;-moz-osx-font-smoothing:grayscale !important;display:block !important;font-family:Lato, "Noto Sans", sans-serif !important;font-weight:400 !important;font-size:14px !important;line-height:18px !important;color:rgba(33,36,44,0.64) !important;margin-bottom:8px !important;margin-top:4px !important;}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._4t1yfcf{display:none !important;}}._13wkizth{-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;-webkit-align-items:center !important;align-items:center !important;border-left:1px solid rgba(33,36,44,0.08) !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex:0 0 72px !important;-ms-flex:0 0 72px !important;flex:0 0 72px !important;-webkit-justify-content:center !important;justify-content:center !important;}._1hmx89oj{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:vertical !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;-webkit-align-items:center !important;align-items:center !important;}._rflrqt{-ms-flex-positive:1 !important;-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-align-items:center !important;align-items:center !important;overflow:hidden !important;-webkit-flex:1 !important;-ms-flex:1 !important;flex:1 !important;-webkit-flex-grow:1 !important;flex-grow:1 !important;padding-top:24px !important;padding-bottom:28px !important;padding-left:32px !important;}@media screen and (max-width: 1199px) /* mediaQueries.lgOrSmaller */{._rflrqt{padding-left:32px !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._rflrqt{padding-left:16px !important;padding-top:22px !important;padding-bottom:22px !important;}}._wed53s{-ms-flex-positive:1 !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-flex-grow:1 !important;flex-grow:1 !important;}@media screen and (max-width: 567px) /* mediaQueries.xsOrSmaller */{._wed53s{padding-right:16px !important;}}._1398zhdl{-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-justify-content:center !important;justify-content:center !important;width:100% !important;}._guh7z0{-webkit-box-pack:start !important;-ms-flex-pack:start !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex 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aria-current="true"><div class="_1iameqt8" data-webtasks-id="bd07f5ad-69fd-4f53"><div class="_pxfwtyj" data-webtasks-id="c0b343d8-63df-4e7a"><span class="_1o9uji3c" data-webtasks-id="d9f59003-506d-43cb">Unit 3</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="987a6fdd-f025-4117"></div><span class="_1lzcqmvq" data-webtasks-id="d7303aba-4808-4968">Forces and Newton's laws of motion</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/centripetal-force-and-gravitation" data-webtasks-id="ca32a93e-6259-4d04"><div class="_1z0ly7r0" data-webtasks-id="8a63bbd6-9fe9-420f"><div class="_jsh6de6" data-webtasks-id="ae7919bb-d39c-4908"><div class="_pxfwtyj" data-webtasks-id="e8844642-ab37-448c"><span class="_1o9uji3c" data-webtasks-id="d4f510c2-dc7c-45ff">Unit 4</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="94f2d6f3-298e-40f8"></div><span class="_xy39ea8" data-webtasks-id="2d8282e3-5bc4-4c73">Centripetal force and gravitation</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/work-and-energy" data-webtasks-id="4aaff850-a239-4cbe"><div class="_1z0ly7r0" data-webtasks-id="68ab0490-408a-43d1"><div class="_jsh6de6" data-webtasks-id="4026d983-5395-480d"><div class="_pxfwtyj" data-webtasks-id="8189c04e-d662-44d6"><span class="_1o9uji3c" data-webtasks-id="10347d53-dd58-4559">Unit 5</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="06e14d67-2294-43d0"></div><span class="_xy39ea8" data-webtasks-id="f12e3c2b-92c6-42f7">Work and energy</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/linear-momentum" data-webtasks-id="1e4e482f-cbbb-4eb8"><div class="_1z0ly7r0" data-webtasks-id="fb740cf9-3b07-45db"><div class="_jsh6de6" data-webtasks-id="47ffbc0b-8134-48c0"><div class="_pxfwtyj" data-webtasks-id="f120d1e1-f883-4f93"><span class="_1o9uji3c" data-webtasks-id="9e50ab95-07d8-49c9">Unit 6</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="6f763aca-daea-412f"></div><span class="_xy39ea8" data-webtasks-id="9e72b59f-9d0e-4cf0">Impacts and linear momentum</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/torque-angular-momentum" data-webtasks-id="0aa477cf-3610-4e85"><div class="_1z0ly7r0" data-webtasks-id="19210300-5f89-4f64"><div class="_jsh6de6" data-webtasks-id="6f106fb9-13b2-4c13"><div class="_pxfwtyj" data-webtasks-id="9e9dd604-3549-4770"><span class="_1o9uji3c" data-webtasks-id="eb17fa7e-c3f0-4cc7">Unit 7</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="42d0297f-f1df-4e8c"></div><span class="_xy39ea8" data-webtasks-id="6df8fc0b-998a-4aea">Torque and angular momentum</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/mechanical-waves-and-sound" data-webtasks-id="fd275b22-3e2b-48d2"><div class="_1z0ly7r0" data-webtasks-id="720353d4-da4e-4094"><div class="_jsh6de6" data-webtasks-id="7f5cd361-8fbe-4d2e"><div class="_pxfwtyj" data-webtasks-id="a1b6191e-f31a-44f7"><span class="_1o9uji3c" data-webtasks-id="cc4a38da-531d-400b">Unit 8</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="ae112c16-76d4-4f3a"></div><span class="_xy39ea8" data-webtasks-id="14b83615-c189-4960">Oscillations and mechanical waves</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/fluids" data-webtasks-id="2a691ebb-30c0-4557"><div class="_1z0ly7r0" data-webtasks-id="aaab5462-954f-4b0a"><div class="_jsh6de6" data-webtasks-id="b839c5ae-e44f-4ecc"><div class="_pxfwtyj" data-webtasks-id="08823376-a3a2-4a39"><span class="_1o9uji3c" data-webtasks-id="6575d51c-ddb7-48ff">Unit 9</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="6c381058-c90c-4da5"></div><span class="_xy39ea8" data-webtasks-id="47987963-a479-4a4e">Fluids</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/thermodynamics" data-webtasks-id="c9872e9f-b887-4ba3"><div class="_1z0ly7r0" data-webtasks-id="706f2c7b-53e3-42bb"><div class="_jsh6de6" data-webtasks-id="19c8a822-4b14-4911"><div class="_pxfwtyj" data-webtasks-id="b938e9f3-2ea1-45ea"><span class="_1o9uji3c" data-webtasks-id="06b65559-ba55-439d">Unit 10</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="bf431e4c-5596-4375"></div><span class="_xy39ea8" data-webtasks-id="73958983-c472-4197">Thermodynamics</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/electric-charge-electric-force-and-voltage" data-webtasks-id="45f4a772-e499-40b7"><div class="_1z0ly7r0" data-webtasks-id="00740d3b-63df-4020"><div class="_jsh6de6" data-webtasks-id="a114fe36-9db0-4ede"><div class="_pxfwtyj" data-webtasks-id="5bfd3f4d-649c-423b"><span class="_1o9uji3c" data-webtasks-id="eef4a2df-d707-40d2">Unit 11</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="d964b013-da21-4dd7"></div><span class="_xy39ea8" data-webtasks-id="b1bf4a21-5acc-49e5">Electric charge, field, and potential</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/circuits-topic" data-webtasks-id="ff70f775-0ef3-4daa"><div class="_1z0ly7r0" data-webtasks-id="cf869bde-3bcf-4c62"><div class="_jsh6de6" data-webtasks-id="f987af07-859e-4439"><div class="_pxfwtyj" data-webtasks-id="948ccf61-e328-4d4f"><span class="_1o9uji3c" data-webtasks-id="ce6b5ed3-0203-468b">Unit 12</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="7f04814d-622a-42c3"></div><span class="_xy39ea8" data-webtasks-id="83a1b6c2-1323-4d04">Circuits</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/magnetic-forces-and-magnetic-fields" data-webtasks-id="4df0b041-e355-465e"><div class="_1z0ly7r0" data-webtasks-id="e78f47f6-1961-40cf"><div class="_jsh6de6" data-webtasks-id="095e922b-c029-4538"><div class="_pxfwtyj" data-webtasks-id="49f3c195-dcf0-4b73"><span class="_1o9uji3c" data-webtasks-id="4a24e01b-35e1-403d">Unit 13</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="328981df-7fc0-488e"></div><span class="_xy39ea8" data-webtasks-id="5c72f0c0-77cb-4e36">Magnetic forces, magnetic fields, and Faraday's law</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/light-waves" data-webtasks-id="540dddc6-c7b1-4bfe"><div class="_1z0ly7r0" data-webtasks-id="8a0df861-8848-4c22"><div class="_jsh6de6" data-webtasks-id="1ed85d1a-d6f1-4d08"><div class="_pxfwtyj" data-webtasks-id="b4609284-0fd7-4e4a"><span class="_1o9uji3c" data-webtasks-id="1abc25c8-92ef-4e4b">Unit 14</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="0c2f893b-f4b4-4e76"></div><span class="_xy39ea8" data-webtasks-id="23be27be-ad6b-4a0c">Electromagnetic waves and interference</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/geometric-optics" data-webtasks-id="a6668530-67ee-48f7"><div class="_1z0ly7r0" data-webtasks-id="a589499b-a438-4653"><div class="_jsh6de6" data-webtasks-id="999cb30d-e307-4af5"><div class="_pxfwtyj" data-webtasks-id="1933919e-6791-4ec7"><span class="_1o9uji3c" data-webtasks-id="aa45d5b5-ab8a-4c7e">Unit 15</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="012ab1f8-11af-43dd"></div><span class="_xy39ea8" data-webtasks-id="e749430f-47dd-4c9b">Geometric optics</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/special-relativity" data-webtasks-id="a8e79685-aab1-470f"><div class="_1z0ly7r0" data-webtasks-id="f9a2105f-1c8f-4a17"><div class="_jsh6de6" data-webtasks-id="35c5e6c1-73c3-4569"><div class="_pxfwtyj" data-webtasks-id="fb94dba2-d577-4b13"><span class="_1o9uji3c" data-webtasks-id="f1dcd4b1-e1a1-4622">Unit 16</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="39798632-13e5-46d5"></div><span class="_xy39ea8" data-webtasks-id="095ae275-1909-419f">Special relativity </span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/quantum-physics" data-webtasks-id="5af8f5ed-49a7-46cd"><div class="_1z0ly7r0" data-webtasks-id="caef427c-03f1-4922"><div class="_jsh6de6" data-webtasks-id="f6c038d2-a09c-4b14"><div class="_pxfwtyj" data-webtasks-id="02ad425a-5968-4378"><span class="_1o9uji3c" data-webtasks-id="cdc5e015-d4de-4b89">Unit 17</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="46f4fbbf-32dd-4031"></div><span class="_xy39ea8" data-webtasks-id="e5c69f0b-5e3e-4202">Quantum Physics</span></div></div></div></a><a class="_5tdxkjz" href="/science/physics/discoveries" data-webtasks-id="d188e2bf-9315-448d"><div class="_1z0ly7r0" data-webtasks-id="84047f40-52f2-4988"><div class="_jsh6de6" data-webtasks-id="d9936a8b-d8bb-48bd"><div class="_pxfwtyj" data-webtasks-id="e4ee6036-5879-45bc"><span class="_1o9uji3c" data-webtasks-id="bbebc9a1-e512-4ca9">Unit 18</span><div aria-hidden="true" class="_1lf56ego" data-webtasks-id="30c55b6a-2561-4904"></div><span class="_xy39ea8" data-webtasks-id="7d7be119-67c8-4b57">Discoveries and projects</span></div></div></div></a><a class="_5tdxkjz" 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style="flex-basis: 16px; flex-shrink: 0;"></div><span class="_1lbcxvfr" data-webtasks-id="a7813e26-2817-4eb8">This unit is part of the Physics library. Browse videos, articles, and exercises by topic.</span></div></div></div><div class="_qcjzh6" data-slug="newtons-laws-of-motion" tabindex="-1" data-webtasks-id="9148d68e-0d23-4f9d"><div class="_2qe0as" data-test-id="lesson-card" data-webtasks-id="dd2738c2-0f6a-45b6"><div class="_1lwwhwr" data-webtasks-id="4795abd0-9275-40b1"><div class="_lqicet" data-webtasks-id="87ae2735-b938-410a"><h2 class="_v5zh60p" data-webtasks-id="ced371f3-d41c-4338"><a data-test-id="lesson-card-link" class="_dwmetq" href="/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-1st-law-of-motion" data-webtasks-id="314e85f3-557e-4ec7">Newton's laws of motion</a></h2></div><div class="_1g8ypdt" data-webtasks-id="87e3bf2c-2ffa-44e2"><div class="_13ise4e" data-webtasks-id="0db4422a-6d88-4c07"><h3 data-webtasks-id="0b9264b2-7ddc-4bb1" style="padding-bottom: 21px; margin-bottom: 0px;"><span class="_1q19l6p3" data-webtasks-id="eb2897ff-af7c-441a">Learn</span></h3><ul role="list" class="_37mhyh" 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data-webtasks-id="48ecb8b2-69e7-46fb"><div class="_11igkdh" data-webtasks-id="3be6ede2-7695-45bd"><span class="_14hvi6g8" data-webtasks-id="a17326b9-00c7-4d75">What is weight? </span><div class="_s217esa" data-webtasks-id="0befa47c-5c1f-4742">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="62a01ba2-2187-4288"><div class="_10ct3cvu" data-webtasks-id="2e2b6600-dd1b-4d51"><div class="_stw1dyg" data-webtasks-id="c88b1b12-5a91-4cc0"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/normal-contact-force/v/normal-force-in-an-elevator" data-webtasks-id="4e0fc223-1fec-41da"><div class="_1s8mywu" data-webtasks-id="4aaf5c10-354d-4c43"><div class="_1d4mskp" data-webtasks-id="f0fea281-6b28-45ea"><div data-webtasks-id="68054701-2d7d-44b1"><span data-webtasks-id="a3fbd0d7-ab3f-43b6"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="9f095e6b-fcf1-45bf" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg 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modal)</div></div></div></a></div></div></li><li data-webtasks-id="cfc1bd71-3243-49d2"><div class="_10ct3cvu" data-webtasks-id="8b578892-5cb7-441c"><div class="_stw1dyg" data-webtasks-id="0cb31e3a-1a54-4222"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/normal-contact-force/v/more-on-normal-force-shoe-on-floor" data-webtasks-id="1800557b-a752-4a9e"><div class="_1s8mywu" data-webtasks-id="ce40cacd-9d1f-4477"><div class="_1d4mskp" data-webtasks-id="a910c3a8-7ee2-4205"><div data-webtasks-id="ec88ea1c-2991-4558"><span data-webtasks-id="69f0ec3c-4fcd-4ccb"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="78372c4e-8fba-49c4" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="77fb6d77-d6e5-4ef3"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="74d9aa43-94b7-4a53"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="2499dfc3-f5de-4e8d"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="8b51a3fb-d066-42c7"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="4d6b7f5f-af8a-4ce8"><div class="_11igkdh" data-webtasks-id="f10aa62e-b00a-45f4"><span class="_14hvi6g8" data-webtasks-id="af1f0b9c-b8eb-4b7f">More on Normal force (shoe on floor) </span><div class="_s217esa" data-webtasks-id="a220bcad-ff38-4f8f">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="23d47ab7-dc5d-4b8e"><div class="_10ct3cvu" data-webtasks-id="891e3bce-723f-48bb"><div 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24 24" data-webtasks-id="c4c00850-f7fb-4fca"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="fdf239b0-4fb4-48f2"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="d4230da6-656f-4d70"><div class="_11igkdh" data-webtasks-id="56015273-0b4d-41d8"><span class="_14hvi6g8" data-webtasks-id="89a0443f-c261-40ac">More on Normal force (shoe on wall) </span><div class="_s217esa" data-webtasks-id="f057214d-5216-4140">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="7bb29c04-2404-4e00"><div class="_10ct3cvu" data-webtasks-id="3582e1fe-53cc-49ca"><div class="_stw1dyg" data-webtasks-id="42050906-4f7e-4d3b"><a class="_14jg6rbg" href="/science/physics/forces-newtons-laws/normal-contact-force/a/what-is-normal-force" data-webtasks-id="f0784e2f-b8b4-4735"><div class="_1s8mywu" data-webtasks-id="dd034a20-0ad1-488b"><div class="_1d4mskp" data-webtasks-id="3eb847b0-72b8-4b3d"><div data-webtasks-id="a1273bf4-ba81-4b31"><span data-webtasks-id="54f16c92-c3b2-4649"></span><span aria-label="Article" class="_e296pg" role="img" data-webtasks-id="3540aaa6-16ba-4ed2" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="a8e0151c-d5b2-4a09"><path fill="#21242c" d="M15,16V12h2v5a1,1,0,0,1-1,1H8a1,1,0,0,1-1-1V7A1,1,0,0,1,8,6h3V8H9v8Zm-1.5-6a.5.5,0,0,1-.5-.5V6l4,4Z" data-webtasks-id="0240b519-3d26-4c43"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="b3c82fb2-2604-4076"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" 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href="/science/physics/forces-newtons-laws/balanced-unbalanced-forces/v/balanced-and-unbalanced-forces" data-webtasks-id="3db21ad5-5f28-4438">Balanced and unbalanced forces</a></h2></div><div class="_1g8ypdt" data-webtasks-id="5b3b0272-517b-42c9"><div class="_13ise4e" data-webtasks-id="7e35907e-7b3b-459b"><h3 data-webtasks-id="68208b46-f210-44a6" style="padding-bottom: 21px; margin-bottom: 0px;"><span class="_1q19l6p3" data-webtasks-id="fa80af9b-dd7c-4539">Learn</span></h3><ul role="list" class="_37mhyh" data-webtasks-id="7e17bb74-596f-4910"><li data-webtasks-id="625c7647-ade9-4af6"><div class="_10ct3cvu" data-webtasks-id="88a704ec-f4dd-4194"><div class="_stw1dyg" data-webtasks-id="5be39ec3-c548-4fce"><a class="_1qwvhpzm" href="/science/physics/forces-newtons-laws/balanced-unbalanced-forces/v/balanced-and-unbalanced-forces" data-webtasks-id="f1d8a176-b816-4f45"><div class="_1s8mywu" data-webtasks-id="47c136f8-e9cd-4915"><div class="_1d4mskp" data-webtasks-id="c8525dc4-a22a-4f32"><div 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24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="4d7675c0-25a3-4abe"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="2b7710a6-8a11-4513"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="b563383a-099a-4297"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="61ead683-a464-4c9f"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="1e08a7bd-3fc7-476d"><div class="_11igkdh" data-webtasks-id="9b5a1b5d-ff78-4d56"><span class="_14hvi6g8" data-webtasks-id="97a770e6-53d7-4d33">Unbalanced forces and motion </span><div class="_s217esa" data-webtasks-id="2d57ad19-741f-45c4">(Opens a modal)</div></div></div></a></div></div></li></ul></div><div class="_17ci9h9" data-webtasks-id="3d9e4e78-72ff-4fdd"></div></div></div></div></div><div class="_qcjzh6" data-slug="lubricon-vi" tabindex="-1" data-webtasks-id="8bac0aaa-c9e6-47a8"><div class="_2qe0as" data-test-id="lesson-card" data-webtasks-id="c12593a0-76ba-4f4b"><div class="_1lwwhwr" data-webtasks-id="6d6491f5-1be1-4d5d"><div class="_lqicet" data-webtasks-id="9c642359-8e34-445e"><h2 class="_v5zh60p" data-webtasks-id="bfbf6aed-d4f1-49cf"><a data-test-id="lesson-card-link" class="_dwmetq" href="/science/physics/forces-newtons-laws/lubricon-vi/v/slow-sock-on-lubricon-vi" data-webtasks-id="3009fb0e-4d8f-4d7c">Slow sock on Lubricon VI</a></h2></div><div class="_1g8ypdt" data-webtasks-id="93758970-cd95-4d53"><div class="_13ise4e" data-webtasks-id="25702e0e-d4a8-4611"><h3 data-webtasks-id="d4284b80-26e8-4cda" style="padding-bottom: 21px; margin-bottom: 0px;"><span class="_1q19l6p3" data-webtasks-id="eb254fe6-efcd-4b15">Learn</span></h3><ul role="list" class="_37mhyh" data-webtasks-id="1fe6a22d-3a13-46d0"><li data-webtasks-id="5021ef21-0025-4b39"><div class="_10ct3cvu" data-webtasks-id="ce5d7697-8208-46e5"><div class="_stw1dyg" data-webtasks-id="290dab0e-5b63-4e51"><a class="_1qwvhpzm" href="/science/physics/forces-newtons-laws/lubricon-vi/v/slow-sock-on-lubricon-vi" data-webtasks-id="7e24143f-e1ec-4970"><div class="_1s8mywu" data-webtasks-id="7848359a-6cbb-4905"><div class="_1d4mskp" data-webtasks-id="53fbf3d7-ed4c-441f"><div data-webtasks-id="75a4149f-c3ef-44d1"><span data-webtasks-id="ddccbff6-dadd-4fb5"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="5e97a61f-4b27-40fd" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="d9b8ae71-b361-4ac4"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="5cd6fe37-270a-4f48"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="f31656b8-40a7-4845"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="d9defadd-8ce8-4496"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="97e421bc-cf1a-4810"><div class="_11igkdh" data-webtasks-id="d8de0af4-c64a-4582"><span class="_14hvi6g8" data-webtasks-id="1786a1c2-fb25-4da8">Slow sock on Lubricon VI </span><div class="_s217esa" data-webtasks-id="92690291-ad46-4d2f">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="3ed95fd1-26f7-49ba"><div class="_10ct3cvu" data-webtasks-id="58c27d75-8a64-4d9c"><div class="_stw1dyg" data-webtasks-id="36f71c0c-4c7b-4a86"><a class="_14jg6rbg" href="/science/physics/forces-newtons-laws/lubricon-vi/v/normal-forces-on-lubricon-vi" data-webtasks-id="0dbfd0df-f5fb-4cc9"><div class="_1s8mywu" data-webtasks-id="f5ac8cf1-4458-467c"><div class="_1d4mskp" data-webtasks-id="e660803b-4e61-4b39"><div data-webtasks-id="7d0d48a5-e24d-4f81"><span data-webtasks-id="c469961e-7eb7-4c6c"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="8356257a-07a2-4536" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="a682f876-8cc5-4ed8"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="9bc2a643-9c31-4ccd"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="14b70cec-b29e-424a"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="099c3940-8af9-4604"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="5b78f674-dcc4-4de3"><div class="_11igkdh" data-webtasks-id="7a42d01d-0f26-4aba"><span class="_14hvi6g8" data-webtasks-id="ccb19839-d128-43bf">Normal forces on Lubricon VI </span><div class="_s217esa" data-webtasks-id="69ff17fb-40f3-4e63">(Opens a modal)</div></div></div></a></div></div></li></ul></div><div class="_17ci9h9" data-webtasks-id="94340c09-59cc-4390"></div></div></div></div></div><div class="_qcjzh6" data-slug="inclined-planes-friction" tabindex="-1" data-webtasks-id="3005d0b5-f9f5-419c"><div class="_2qe0as" data-test-id="lesson-card" data-webtasks-id="6b0b2bd7-70f7-4201"><div class="_1lwwhwr" data-webtasks-id="38274d7b-b0c6-436a"><div class="_lqicet" data-webtasks-id="dfa6db03-97c7-4e61"><h2 class="_v5zh60p" data-webtasks-id="40baafbd-60c4-4982"><a data-test-id="lesson-card-link" class="_dwmetq" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/inclined-plane-force-components" data-webtasks-id="32d90a75-b92a-46bf">Inclined planes and friction</a></h2></div><div class="_1g8ypdt" data-webtasks-id="0b372431-9776-4ca8"><div class="_13ise4e" data-webtasks-id="9df573d8-808b-477b"><h3 data-webtasks-id="8ce82617-ea5b-4676" style="padding-bottom: 21px; margin-bottom: 0px;"><span class="_1q19l6p3" data-webtasks-id="d249acaf-9bbd-4e17">Learn</span></h3><ul role="list" class="_37mhyh" data-webtasks-id="2ca88168-cc78-4e82"><li data-webtasks-id="1d75980c-3abc-4afa"><div class="_10ct3cvu" data-webtasks-id="64e9837d-cd3d-497d"><div class="_stw1dyg" data-webtasks-id="51aaa49f-078d-46b2"><a class="_1qwvhpzm" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/inclined-plane-force-components" data-webtasks-id="4bbf1b7b-9c98-4305"><div class="_1s8mywu" data-webtasks-id="7e506d7b-5956-48b0"><div class="_1d4mskp" data-webtasks-id="f85feb05-0a1a-4abf"><div data-webtasks-id="57c44361-12a0-4a46"><span data-webtasks-id="e40547a1-985d-4c72"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="73b411ed-754d-4165" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="f7600947-e77f-4331"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="65cc333c-4655-4f94"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="806b8bfb-15e8-4b13"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="1db52b90-f878-4c06"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="e00f39a6-34f7-4897"><div class="_11igkdh" data-webtasks-id="a74f358a-4791-4359"><span class="_14hvi6g8" data-webtasks-id="edb4ab28-53e7-4a8e">Inclined plane force components </span><div class="_s217esa" data-webtasks-id="c678f428-42c3-4185">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="62010c4e-e9c5-4d23"><div class="_10ct3cvu" data-webtasks-id="cf117dc2-a320-410d"><div class="_stw1dyg" data-webtasks-id="a3e14a76-d775-4140"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/ice-accelerating-down-an-incline" data-webtasks-id="fb22e05f-5290-4dd3"><div class="_1s8mywu" data-webtasks-id="3671d59c-c6af-4142"><div class="_1d4mskp" data-webtasks-id="a8989418-0268-4f7a"><div data-webtasks-id="a1947ca4-a7cf-4316"><span data-webtasks-id="105f6c74-dca2-4f16"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="51d642f1-ac4a-47f0" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="3f1067ac-c0fb-431d"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="bb074d34-93f2-4884"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="3e90ee77-4494-47ba"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="9a16abda-56d0-4ced"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="27924fbd-3420-4e34"><div class="_11igkdh" data-webtasks-id="de85e9b7-93d6-49d0"><span class="_14hvi6g8" data-webtasks-id="0059dc2a-8965-4d18">Ice accelerating down an incline </span><div class="_s217esa" data-webtasks-id="cb03fad4-c99f-4d81">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="5dedc3a7-aac6-4ca2"><div class="_10ct3cvu" data-webtasks-id="845fbc20-d88d-4a36"><div class="_stw1dyg" data-webtasks-id="c3955edb-de62-4fc8"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/force-of-friction-keeping-the-block-stationary" data-webtasks-id="273003cd-b35e-418f"><div class="_1s8mywu" data-webtasks-id="fac1065e-38a9-4d45"><div class="_1d4mskp" data-webtasks-id="7e997068-7a4b-4451"><div data-webtasks-id="bae928ab-4b7f-4609"><span data-webtasks-id="1d6ec0e7-9519-4927"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="2152c517-d7fd-4d28" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="3b522cb5-52a2-4e16"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="f4650345-9a93-4adf"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="7a597e25-f734-4bfc"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="b9a92081-311e-4434"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="3818cab5-c46a-4b9d"><div class="_11igkdh" data-webtasks-id="8c0068d4-96f5-4087"><span class="_14hvi6g8" data-webtasks-id="ca6b7148-a2c9-4c64">Force of friction keeping the block stationary </span><div class="_s217esa" data-webtasks-id="c832157e-f698-4647">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="1ba61beb-7e23-4e9e"><div class="_10ct3cvu" data-webtasks-id="f4ab2a23-5c32-46c9"><div class="_stw1dyg" data-webtasks-id="f6a83a43-76e8-4e3d"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/correction-of-force-of-friction-keeping-the-block-stationary" data-webtasks-id="171ae89f-3c6b-4787"><div class="_1s8mywu" data-webtasks-id="eb74bb72-616f-4145"><div class="_1d4mskp" data-webtasks-id="2695de8d-cb8b-4637"><div data-webtasks-id="9c6f35e2-ad3d-4815"><span data-webtasks-id="5c336401-b553-4d42"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="bc512d0f-0741-45b4" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="c4b621e6-ef00-421b"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="7c8d4fcd-c3f9-4ef9"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="72b9aefe-5a75-430d"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="1bbe2341-1043-4468"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="72ede736-6358-4b8a"><div class="_11igkdh" data-webtasks-id="a440df31-db3a-4dbf"><span class="_14hvi6g8" data-webtasks-id="6f1e98b2-05fa-4c9e">Correction to force of friction keeping the block stationary </span><div class="_s217esa" data-webtasks-id="15ea2475-952e-408d">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="8d1d9c29-007d-4aa4"><div class="_10ct3cvu" data-webtasks-id="cc18c9bd-11e4-446e"><div class="_stw1dyg" data-webtasks-id="44d39e45-f24b-4739"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/force-of-friction-keeping-velocity-constant" data-webtasks-id="4640f212-02ed-4737"><div class="_1s8mywu" data-webtasks-id="8ec3a0ef-9523-42fd"><div class="_1d4mskp" data-webtasks-id="6ccaccb9-7e03-4904"><div data-webtasks-id="fe1017b2-7611-43a1"><span data-webtasks-id="8e008059-b363-45ab"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="f32d2f8b-e682-4a41" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="1667b42a-0288-4520"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="44ae561f-2b8d-4f7c"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="8d1a66a0-2839-4caf"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="51078c48-83e6-44e3"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="fd890af5-dae1-434a"><div class="_11igkdh" data-webtasks-id="697a4884-017e-4d11"><span class="_14hvi6g8" data-webtasks-id="2b85da8c-d7d9-47bd">Force of friction keeping velocity constant </span><div class="_s217esa" data-webtasks-id="917d4e6e-0073-44dc">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="f0a5ee86-14b5-4039"><div class="_10ct3cvu" data-webtasks-id="c0a39363-6fa1-4eba"><div class="_stw1dyg" data-webtasks-id="fce5e4e4-feaa-48db"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/intuition-on-static-and-kinetic-friction-comparisons" data-webtasks-id="912a8507-ec0c-4062"><div class="_1s8mywu" data-webtasks-id="9c14a9ab-56f4-413c"><div class="_1d4mskp" data-webtasks-id="7912f88e-6357-40ce"><div data-webtasks-id="b2821ceb-f951-4a3f"><span data-webtasks-id="43d6b4f2-5aca-463d"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="77314991-28ed-48ec" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="04090b84-63ef-4a58"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="010885af-cef3-4fa2"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="09633a40-46f8-42db"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="55d6d6be-44d5-4648"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="d32b4ade-087d-4dc5"><div class="_11igkdh" data-webtasks-id="f61d7298-82fb-407f"><span class="_14hvi6g8" data-webtasks-id="9a44f45f-d53b-4d61">Intuition on static and kinetic friction comparisons </span><div class="_s217esa" data-webtasks-id="f334b8b8-185c-445b">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="0ea48056-27ee-49ee"><div class="_10ct3cvu" data-webtasks-id="4deb59f0-5e0e-42cf"><div class="_stw1dyg" data-webtasks-id="79e63d14-cf94-4bc1"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/v/static-and-kinetic-friction-example" data-webtasks-id="0c612652-1eeb-413d"><div class="_1s8mywu" data-webtasks-id="163ac259-2005-4495"><div class="_1d4mskp" data-webtasks-id="95e78c40-50d3-4f24"><div data-webtasks-id="156a1e23-c37f-48f4"><span data-webtasks-id="21ed735f-676b-4593"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="f9e1d57b-ffc0-469d" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="796dda8b-31d3-4a6f"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="9cb0d57b-908b-4fb8"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="607b725a-3eaf-410e"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="46989379-6cf6-443f"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="b1d0e78f-d8b9-43ee"><div class="_11igkdh" data-webtasks-id="7a2d1ab4-d9e0-4cfc"><span class="_14hvi6g8" data-webtasks-id="30a0eb73-c768-46e0">Static and kinetic friction example </span><div class="_s217esa" data-webtasks-id="d292e4b1-b828-4929">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="dc5ebe11-9eb7-4949"><div class="_10ct3cvu" data-webtasks-id="792a0e2d-9d0b-430f"><div class="_stw1dyg" data-webtasks-id="5b9dd63c-e83a-4c8a"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/inclined-planes-friction/a/what-is-friction" data-webtasks-id="5a950797-29fb-4b9f"><div class="_1s8mywu" data-webtasks-id="ca75dbc8-99d7-48b5"><div class="_1d4mskp" data-webtasks-id="7b6bab83-72fa-4feb"><div data-webtasks-id="07965138-75b6-4d73"><span data-webtasks-id="04a169c9-95f6-4cde"></span><span aria-label="Article" class="_e296pg" role="img" data-webtasks-id="6f10d6b9-7ce8-4adc" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="e13d1758-2cdf-46f2"><path fill="#21242c" d="M15,16V12h2v5a1,1,0,0,1-1,1H8a1,1,0,0,1-1-1V7A1,1,0,0,1,8,6h3V8H9v8Zm-1.5-6a.5.5,0,0,1-.5-.5V6l4,4Z" data-webtasks-id="82dde94f-c12c-4367"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="f0ccd21f-0457-4ff7"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="b1cedb4c-31f9-4c24"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="882fa76b-c13f-4fb0"><div class="_11igkdh" data-webtasks-id="0239a915-1694-492e"><span class="_14hvi6g8" data-webtasks-id="ae346ed9-9512-4e94">What is friction? </span><div class="_s217esa" data-webtasks-id="ea2c30bc-5dcf-4e3c">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="ef83b972-0d41-41da"><div class="_10ct3cvu" data-webtasks-id="762af9e7-08a3-4bdc"><div class="_stw1dyg" data-webtasks-id="29402b75-97a8-466f"><a class="_14jg6rbg" href="/science/physics/forces-newtons-laws/inclined-planes-friction/a/what-are-inclines" data-webtasks-id="14f20e43-df2f-458c"><div class="_1s8mywu" data-webtasks-id="8f8d6d6a-e38e-4422"><div class="_1d4mskp" data-webtasks-id="7b709fa8-b0db-4408"><div data-webtasks-id="cea62303-346b-4bd1"><span data-webtasks-id="ae932920-1753-4ff3"></span><span aria-label="Article" class="_e296pg" role="img" data-webtasks-id="6c9f620e-603f-45c9" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="30a24c4d-fdc3-4e14"><path fill="#21242c" d="M15,16V12h2v5a1,1,0,0,1-1,1H8a1,1,0,0,1-1-1V7A1,1,0,0,1,8,6h3V8H9v8Zm-1.5-6a.5.5,0,0,1-.5-.5V6l4,4Z" data-webtasks-id="71130894-ace0-4d84"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="88de671a-8d27-4518"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="5089e896-0212-4c63"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="ee5b1d3f-18ba-473c"><div class="_11igkdh" data-webtasks-id="60a17577-87f0-4054"><span class="_14hvi6g8" data-webtasks-id="916ac5ab-0169-470a">What are inclines? </span><div class="_s217esa" data-webtasks-id="b8db2d61-1506-403f">(Opens a modal)</div></div></div></a></div></div></li></ul></div><div class="_17ci9h9" data-webtasks-id="13fe527b-2461-451c"></div></div></div></div></div><div class="_qcjzh6" data-slug="tension-tutorial" tabindex="-1" data-webtasks-id="6c5fcf76-bede-413d"><div class="_2qe0as" data-test-id="lesson-card" data-webtasks-id="2f315d30-9c93-43b3"><div class="_1lwwhwr" data-webtasks-id="5204d745-803e-486a"><div class="_lqicet" data-webtasks-id="6944ba9f-cee6-4a48"><h2 class="_v5zh60p" data-webtasks-id="ee6332d0-90ac-43a9"><a data-test-id="lesson-card-link" class="_dwmetq" href="/science/physics/forces-newtons-laws/tension-tutorial/v/the-force-of-tension" data-webtasks-id="59972483-5140-43da">Tension</a></h2></div><div class="_1g8ypdt" data-webtasks-id="1ab5fe56-a4c0-452b"><div class="_13ise4e" data-webtasks-id="b8516c42-a90c-4fc4"><h3 data-webtasks-id="63fedb20-e316-4192" style="padding-bottom: 21px; margin-bottom: 0px;"><span class="_1q19l6p3" data-webtasks-id="bdb6de48-4bfa-44dd">Learn</span></h3><ul role="list" class="_37mhyh" data-webtasks-id="91aee14c-2833-49a4"><li data-webtasks-id="01ab0ac8-ed68-4eab"><div class="_10ct3cvu" data-webtasks-id="b9a93022-ea40-4a47"><div class="_stw1dyg" data-webtasks-id="b268b82f-3e9c-40c7"><a class="_1qwvhpzm" href="/science/physics/forces-newtons-laws/tension-tutorial/v/the-force-of-tension" data-webtasks-id="f6b9e0ce-0e4c-4d6c"><div class="_1s8mywu" data-webtasks-id="fb2f005e-7f6a-4cbe"><div class="_1d4mskp" data-webtasks-id="21e56159-e2bc-4567"><div data-webtasks-id="97050367-93b3-4859"><span data-webtasks-id="8b49483d-8e6e-47d2"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="9b233666-ccb5-4c9a" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="1173f963-62fe-46b2"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="e7b7bb9c-e045-4fa6"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="07a773f9-f91c-40b1"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="0a8ab97f-70b2-442c"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="505e6ae6-61fe-4511"><div class="_11igkdh" data-webtasks-id="f664ccf4-6d0a-4046"><span class="_14hvi6g8" data-webtasks-id="43b277a2-b278-4983">The force of tension </span><div class="_s217esa" data-webtasks-id="272bcbef-ff7c-4c92">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="45beddbf-5fa7-4909"><div class="_10ct3cvu" data-webtasks-id="9e97781f-5b55-45d1"><div class="_stw1dyg" data-webtasks-id="5abd4233-2644-43ca"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/tension-tutorial/v/mild-and-medium-tension" data-webtasks-id="f92a55f0-e5da-4813"><div class="_1s8mywu" data-webtasks-id="934d9e24-7754-4bcc"><div class="_1d4mskp" data-webtasks-id="af7cac45-3fff-4f2d"><div data-webtasks-id="77e0ba3a-d3b7-45e5"><span data-webtasks-id="ecf7e64b-f250-4ab3"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="cd97d739-ba03-496c" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="504677ea-e3b5-4c4c"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="0fdfea6e-3f90-4851"></path></svg><svg 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data-webtasks-id="7866a6db-d190-477a"><div class="_1s8mywu" data-webtasks-id="69d2560d-98d8-4a67"><div class="_1d4mskp" data-webtasks-id="5afa71a4-173e-472a"><div data-webtasks-id="89dce849-bc67-4986"><span data-webtasks-id="5955d91a-bab3-49c1"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="c6670710-a864-439e" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="cc350552-3d05-4fcb"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="ca8b2234-1aa4-4660"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="99952d99-7247-419f"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="d71a5731-178e-4dbd"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="fa340500-8cef-4ad7"><div class="_11igkdh" data-webtasks-id="cb81f71c-084b-4e06"><span class="_14hvi6g8" data-webtasks-id="ef993fba-6eae-4cf9">Super hot tension </span><div class="_s217esa" data-webtasks-id="282c3d6d-18a6-4bae">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="570e3396-b932-48d1"><div class="_10ct3cvu" data-webtasks-id="efe4e6f4-5ca0-47a4"><div class="_stw1dyg" data-webtasks-id="31dcad51-d038-4c47"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/tension-tutorial/a/what-is-tension" data-webtasks-id="ac08c0ce-c7e5-4f16"><div class="_1s8mywu" data-webtasks-id="6b399294-f14b-48df"><div class="_1d4mskp" data-webtasks-id="d496ceea-6f07-4d7e"><div 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data-webtasks-id="34ec65b3-1edd-4bae"><div class="_11igkdh" data-webtasks-id="97cf8134-5a5d-4a14"><span class="_14hvi6g8" data-webtasks-id="95627a14-5e0c-40df">What is tension? </span><div class="_s217esa" data-webtasks-id="34596c26-f52b-4623">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="1a549b62-e9dd-4f03"><div class="_10ct3cvu" data-webtasks-id="f4c3b75f-5f69-4e66"><div class="_stw1dyg" data-webtasks-id="daff9ed2-9c60-476b"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/tension-tutorial/v/introduction-to-tension" data-webtasks-id="cfb40f3d-dc07-423b"><div class="_1s8mywu" data-webtasks-id="a6ce9f37-0d72-4363"><div class="_1d4mskp" data-webtasks-id="9411453d-4603-42a9"><div data-webtasks-id="3744d392-12e4-4fdf"><span data-webtasks-id="8dc07aa2-7204-41bb"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="0ee2e51b-874a-4d3d" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg 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modal)</div></div></div></a></div></div></li><li data-webtasks-id="f93c38c5-e441-4ff7"><div class="_10ct3cvu" data-webtasks-id="27bd8579-8f69-48d1"><div class="_stw1dyg" data-webtasks-id="7b345e6e-b353-4a3b"><a class="_gl1g2rh" href="/science/physics/forces-newtons-laws/tension-tutorial/v/tension-part-2" data-webtasks-id="43dea283-5469-487e"><div class="_1s8mywu" data-webtasks-id="fe8ca5f2-6bd9-42b8"><div class="_1d4mskp" data-webtasks-id="e7291ac7-daaa-40bb"><div data-webtasks-id="f264c01e-c5f9-46e0"><span data-webtasks-id="845531a0-6468-4f61"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="0f5f48e3-5b29-4e3c" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="e9542fc9-8686-4526"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="d97072d9-46ea-4ca0"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="b650e86d-2756-426f"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="3b65bdf6-88bc-4885"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="abc507ed-466d-4882"><div class="_11igkdh" data-webtasks-id="934e2b91-0471-4bc1"><span class="_14hvi6g8" data-webtasks-id="959a7a3c-ff77-4b85">Introduction to tension (part 2) </span><div class="_s217esa" data-webtasks-id="a6c59c55-3c19-44eb">(Opens a modal)</div></div></div></a></div></div></li><li data-webtasks-id="16d1dfeb-409a-41f5"><div class="_10ct3cvu" data-webtasks-id="c68af386-f25f-4be8"><div class="_stw1dyg" data-webtasks-id="b87abaa0-164a-4fcd"><a class="_14jg6rbg" href="/science/physics/forces-newtons-laws/tension-tutorial/v/tension-in-an-accelerating-system-and-pie-in-the-face" data-webtasks-id="6510b12c-1afb-4662"><div class="_1s8mywu" data-webtasks-id="2ded3b3b-a9fb-4c3f"><div class="_1d4mskp" data-webtasks-id="6cf2f81c-3047-4a57"><div data-webtasks-id="49f4a2fd-bb3f-4f09"><span data-webtasks-id="5c8a48e3-41f2-4845"></span><span aria-label="Video" class="_e296pg" role="img" data-webtasks-id="41381b2e-743f-4ae0" style="display: block; width: 24px; height: 24px; font-size: 24px;"><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="aa60c1f6-f14c-4519"><path fill="#21242c" d="M10.55,7.17l6,4a1,1,0,0,1,0,1.66l-6,4A1,1,0,0,1,9,16V8A1,1,0,0,1,10.55,7.17Zm.45,7L14.2,12,11,9.87Z" data-webtasks-id="21568384-f099-4b4a"></path></svg><svg aria-hidden="true" class="_1mv4i87" focusable="false" width="1em" height="1em" viewBox="0 0 24 24" data-webtasks-id="ac8bd3ec-7c1f-4529"><path fill="rgba(33,36,44,0.50)" d="M2,0H22a2,2,0,0,1,2,2V22a2,2,0,0,1-2,2H2a2,2,0,0,1-2-2V2A2,2,0,0,1,2,0ZM2,1A1,1,0,0,0,1,2V22a1,1,0,0,0,1,1H22a1,1,0,0,0,1-1V2a1,1,0,0,0-1-1Z" data-webtasks-id="a468125d-955c-4ede"></path></svg></span></div></div></div><div class="_1hee5o7j" data-webtasks-id="0625546f-e3bc-40d7"><div class="_11igkdh" data-webtasks-id="a92cfa9a-ade3-4c71"><span class="_14hvi6g8" data-webtasks-id="965ae6e4-0df9-4af3">Tension in an accelerating system and pie in the face </span><div class="_s217esa" data-webtasks-id="1745a01b-bc01-496d">(Opens a modal)</div></div></div></a></div></div></li></ul></div><div class="_17ci9h9" data-webtasks-id="a4915be4-683e-4058"></div></div></div></div></div><div class="_qcjzh6" data-slug="treating-systems" tabindex="-1" data-webtasks-id="09299f7f-6f3a-4a12"><div class="_2qe0as" data-test-id="lesson-card" data-webtasks-id="9b175c2f-629e-425e"><div class="_1lwwhwr" data-webtasks-id="0fdf7fdc-a2fe-43a7"><div class="_lqicet" 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