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: 30cm/5s = 6 cm/s
• 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: if an object with uniform acceleration starts with a zero velocity, then the final velocity is always double the average, in this case it is 12 cm/s.
• By how much did its velocity therefore change?
answer/question/discussion: Change in respect to what?
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: (12 cm/s)/5s = 2.4 cm/s/s
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: Since it is velocity (x) vs. clock time (y), the graph would be parabolic and decreasing at an increasing rate, proving that the object is accelerating as time increases.
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15 min.
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&#Very good responses. Let me know if you have questions. &#