Phy 201
Your 'cq_1_02.2' 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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The problem:
A graph is constructed representing velocity vs. clock time for the interval between clock times t = 5 seconds and t = 13 seconds. The graph consists of a straight line from the point (5 sec, 16 cm/s) to the point (13 sec, 40 cm/s).
• What is the clock time at the midpoint of this interval?
answer/question/discussion: 9 sec
• What is the velocity at the midpoint of this interval?
answer/question/discussion: 28 cm/s
• How far do you think the object travels during this interval?
answer/question/discussion: 252cm
• By how much does the clock time change during this interval?
answer/question/discussion: 8 seconds
• By how much does velocity change during this interval?
answer/question/discussion: 24 cm/s
• What is the average rate of change of velocity with respect to clock time on this interval?
answer/question/discussion: 24/8=3 cm
this quantity has units
• What is the rise of the graph between these points?
answer/question/discussion: 24 cm/s
• What is the run of the graph between these points?
answer/question/discussion: 8s
• What is the slope of the graph between these points?
answer/question/discussion: 24/8=3
this quantity has units
• What does the slope of the graph tell you about the motion of the object during this interval?
answer/question/discussion: it is a positive and steady increase
• What is the average rate of change of the object's velocity with respect to clock time during this interval?
answer/question/discussion: 24/8=3
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15 minutes
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It appears to me that 3 of the questions repeat the same answer.
They do; the question
'What does the slope of the graph tell you about the motion of the object during this interval?'
would be better answered by explaining what these three calculations have in common and why they give you the same result.
Good work, but you neglected units in some of your calculations. You were on the right track on the question of what the slope tells you; see if you can answer that question.
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