Phy 201
Your 'cq_1_02.1' 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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The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
• What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
If it starts at 4cm/sec and ends at 10 cm/sec then we have a combined total of 14cm/sec. This divided by 2 is 7cm/sec. My best guess for the average velocity is 7 cm/sec
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I have no idea how far the ball is travelling and if it is increasing at a constant speed. It could be that the ball is rolling at 4cm/sec all the way to the end and then the track dips significantly and the ball increases to 10cm/sec in a very short time period.
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• If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
If we say that it averaged 7 cm/sec then we would guess that it went 21 cm. This is only a guess because we aren’t sure how the ball was rolling.
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• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
We changed 6 cm\sec over 3 seconds so our average rate of change is 2cm/sec on average.
That would be 2 cm/s^2, not 2 cm/s.
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15 Minutes
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&#Good work. See my notes and let me know if you have questions. &#