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Phy 241
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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: ->->->->->->->->->->->-> :
Theres two answers:
The automobile is moving slower due to all the forces on the car. Assuming air resistance, friction force of the tires on the road and gravity are all forces acting on the car
Therefore the is acually less KE when the car comes back down the incline because of air resistance and frictional forces are both nonconservative forces.
2nd answer
You could also assume that gravity was the only force acting on the car, and therefore the speed of the car would be the same, because gravity is a conservative force, because
the amount of energy lost on the way up is gained by the same gravitational force and no actual energy is lost.
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&#Good responses. Let me know if you have questions. &#