You look over the shoulder of your friend doing a physics problem about a car moving...
You look over the shoulder of your friend doing a physics problem about a car moving over a crest on a hill that approximates a circular path and the car moves with constant speed. Your friend says "I know the answer! The centripetal force plus the normal force cause the upward acceration of the car!!"
You want to help out your friend, so what would you tell them?
| If the car has constant speed then there is no acceleration. |
| Actually there is no such thing as a centripetal force. |
| You are right but you need to include gravitational force and friction because they point in the same direction. |
| You need to include both forces that you mentioned in a free body diagram first, before doing your calculations. |
| You are right but you forgot to include the gravitational force. |
Homework Answers
The correct answer is.....
( You are right but you forgot to include the gravitational force.)
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