phy121
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:
To determine average velocity, divide the distance traveled by the time
30cm/5sec=6 cm/sec.
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:
(0cm/sec + F cm/sec) / 2 = 6 cm/sec, so Final Velocity = 12cm/second
By how much did its velocity therefore change?
answer/question/discussion:
The velocity went from 0 to 12 cm/sec, for a change of 12 cm/second.
At what average rate did its velocity change with respect to clock time?
answer/question/discussion:
We divide change in velocity by change in clock time, so 12cm/second / 5 seconds = 2.4 cm/sec/sec.
What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion:
The graph would be a straight segment beginning at the origin of (0,0), and ending at (5,12). It has a fairly steep slope (2.4).
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10 minutes
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