Phy 121
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A ball accelerates uniformly as it rolls 20 cm down a ramp, starting
from rest, in 2 seconds.
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What are its average velocity, final velocity and
acceleration?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
10 cm/s, 20 cm/s, 10 m/s/s
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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: ->->->->->->->->->->->-> scussion:
It would be going 3% slower than the shown speed.
Correct for speed.
However you have to do the calculations to understand why the percent is different for the acceleration.
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What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
About 3%
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If the percent error is the same for both velocity and
acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> scussion:
As the time interval error increases the velocity would be lessend by
the same percent. In a moment where an object was going 100m/s while the
object was thought to complete the trip in 100 s would find its speed
reduced by three as the time was increased by three.
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If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> scussion:
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15 min
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Solution
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