PHY 121
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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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: ->->->->->->->->->->->-> : vAve = `ds/`dt - -> vAve = 30cm/5s = 6cm/s.
`er11
• 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: ->->->->->->->->->->->-> : since v0=0, vAve*2 = 12cm/s
• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> : 12cm/s – 0cm/s = +12cm/s
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> : (12cm/s)/ (5s) = 2.4cm/s
`er11
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> : It would be a line with a positive slope that is increasing upwards in the first quadrant.
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10 minutes
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I'm not sure if I did the work correctly on this exercise.. it seemed like common sense, even though I looked over the concepts, but I'm unsure of my answers.
Good, except for the units errors.
&#Please compare your solutions with the expanded discussion at the link
Solution
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