question: what is used to stop a vehicle on an incline
choices.text: warmer air rocks a spring sand fluid vibration friction very complex
choices.label: A B C D E F G H
fact2: Brakes are also involved when the vehicle is on an incline.
combinedfact: friction is used to stop a vehicle on an incline
formatted_question: what is used to stop a vehicle on an incline (A) warmer air (B) rocks (C) a spring (D) sand (E) fluid (F) vibration (G) friction (H) very complex