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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.
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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):
The average velocity is 6cm/s. (30cm/5s.)
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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):
The final velocity is therefore 30cm/s.
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@& If final velocity is 30 cm/s, with initial velocity 0, what would be the average velocity? Is this consistent with the average velocity you gave previously?*@
• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The velocity changed by 30cm/s.
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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):
It changed by 30cm/s.
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@& The question asks for an average rate, not for the change in the quantity.*@
• 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 an increasing straight line with an x and y intercept at the origin of the graph (0,0) and a slope of 30.
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@& You should be able to specify the coordinate of the t = 5 second point of the graph. If you do you will find that the slope is not 30. Note also that the slope has, and should include, units.*@
*#&!
@& Please allow yourself 15 minutes to revise. You might well get it in that time. If not, tell me what you do and do not understand and pose questions.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
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If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#