Review for Chapter 2 Test. Question.
I'm having trouble with that problem about the two balls traveling down a track. It's a ball so I guess that means rolling friction means friction isn't a big factor, but they seem to have the same amount of plusses and minuses for the velocity. 1 doesn't have any and 2. increases speed then decreases to back to "original speed" which one is faster in that case. The only difference between the two is the changes in velocity. This applies to 4 and 5. Any ideas?
Thursday, September 3, 2009
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1 comments:
Raul,
This question is testing whether or not you understand average velocity. If the ball on the second track that goes lower will attain a higher speed, and thus will cover the length of the track in a shorter time. It's true, that when it rolls back up to the original level of the track it will slow down, but because it had a higher speed, it covered that distance in less time than the other ball.
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