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Phy 201
Your 'cq_1_03.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_03.1_labelMessages.txt **
The problem:
A ball starts with velocity 0 and accelerates uniformly down a ramp of length 30 cm, covering the distance in 5 seconds.
What is its average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
vAve = Displacement/time
vAve = 30cm/5sec
vAve = 6cm/sec
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If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
You know its average velocity, and you know the initial velocity is zero.
What therefore must be the final velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
(12 + 0)/2 = 6
Therefore the final velocity of the ball is 12cm/sec
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By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
6cm/sec
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This is the average velocity, but it's not the change in velocity.
What is the initial velocity?
What is the final velocity?
What therefore is the change in velocity?
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#$&*
At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
6cm/sec
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This is the average rate of change of position, not velocity, with respect to clock time.
If you go back to the definition of average rate, figure out what quantities go into the calculation of average rate of change of velocity with respect to clock time, I believe you'll get this.
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#$&*
What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
It would be a straight line with a positive slope.
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5 minutes
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You need to apply the definitions a little more carefully, but you're on the right track.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
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