phy 121
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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: ->->->->->->->->->->->-> : The average velocity is 6cm/s. This is obtained by dividing 30 (change in A) by 5 (change in B).
• 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: ->->->->->->->->->->->-> : 12 cm/s (This is twice the average rate)
• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> : The velocity changed by 12 cm/s
Good up through here. There are some errors below.
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> : The velocity changed by 6 cm/s
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> : The graph would consist of the x axis going from 0 – 5 seconds, the y axis going from 0 to 30 cm. The straight line would go from 0 to point 5, 30. The graph would show the velocity increases at a constant rate.
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20 min.
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Solution
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