Phy 231
Your 'cq_1_21.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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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: It will be moving, because in a real world scenario of this nature there would be the forces of gravity and friction opposing the motion of the vehicle up the hill; however, in the motion down the hill the force of gravity would be assisting the motion instead of opposing, while friction will still be opposing. This means that while the KE of motion that was converted to PE of gravity will be regained, the energy lost to friction will not, which gives us less energy to cover the same distance and friction will again be opposing and further removing energy from the vehicle as it moves down the hill.
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5 minutes
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Very well expressed. Take a look at the link, but no revision is necessary.
&#At least part of your solution does not agree with the solution and comments given at the link below. You should view the solution at that link and self-critique as indicated there.
Solution
This link also expands on these topics and alerts you to many of the common errors made by students in the first part of this course. &#