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Phy 121
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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: ->->->->->->->->->->->-> :
The acceleration is 3.16 cm/s^2. The vf is 6.32 cm/s. The average velocity is 3.16cm/s also.
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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: ->->->->->->->->->->->-> :
The acceleration would then be 3.26 cm/s^2 and the vf would be 6.52 cm/s.
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• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
The percent error for acceleration and average velocity is 3.06%. The percent error for final velocity is 3.06% as well.
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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: ->->->->->->->->->->->-> :
I think this is because the average velocity and acceleration are the same. For vf, I think the reason for the percent error being the same is because the answer for vf derives from the avg velocity and acceleration.
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• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
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*#&!
@& You haven't calculated an average acceleration. You need to do so as a basis for your answer about the acceleration. Then base your answer on your result.*@
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