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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: ->->->->->->->->->->->-> :
I am at an internal debate about this one. I want to say the car would be speeding faster because it would have more acceleration on the way down. If I was traveling up the incline and released my foot from the accelerator and started coasting up the hill and then came to a natural stop (no break) and started coasting backwards, I would say the car would be picking up more speed.
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The component of gravity parallel to the incline is the same going up as coming down.
Does gravity do positive or negative work as the car goes up?
Does gravity do positive or negative work as the car comes back down?
What can you therefore conclude about the net work done by gravity on the car, from start to finish?
What about the frictional force exerted on the car? Going up, does it do positive or negative work? Coming back down, does it do positive or negative work?
What can you conclude about the work done by the net force, from start to finish?
How does this affect the kinetic energy?
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