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Phy 201
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A typical automobile coasts up a typically paved incline, stops, and coasts back down to the same position.
When it reaches this position, is it moving faster, slower or at the same speed as when it began? Explain
answer/question/discussion: ->->->->->->->->->->->-> :
Faster because it will be coming down the hill with gravity.
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Gravity is a conservative force. It exerts exactly the same forces as the car travels down as when it travels up.
Going up, gravity slows the car. Coming down, gravity speeds it up.
What other forces act and what is their effect on the motion?
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