phy 201
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A ball accelerates uniformly as it rolls 20 cm down a ramp, starting from rest, in 2 seconds.
What are its average velocity, final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
average velocity = displacement / time = 20/2 = 10cm/s
final velocity = displacement/ time + initial velocity = 20/2 + 0 = 10cm/s.
acceleration = final velaocity - initial velocity / time = 10-0/2 = -5cm/s^2
10 cm/s is the average velocity, not the final velocity.
If the time interval is in error so that it is 3% longer than the actual time interval, then what are the actual values of the final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
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10 minute
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