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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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Asst 3 Question 1
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):
30 cm / 5 s = 6 cm/s
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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 cm/s. It would have to be double the average velocity (because the initial velocity is 0).
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• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
12 cm/s
12 cm/s - 0 cm/s = 12 cm/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):
2.4
12 cm/s / 5 s = 2.4
@& You need units on that result. As you know, the units of (cm/s) / s are cm/s/s or cm/s^2.*@
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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):
A graph increasing at a constant rate in a positive direction.
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About 10 minutes.
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&#This looks good. See my notes. Let me know if you have any questions. &#