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Phy 201
Your 'cq_1_09.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_09.1_labelMessages **
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: ->->->->->->->->->->->-> :
vAve = 10cm/s
vf = 20cm/s
a = 10cm/s^2
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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: ->->->->->->->->->->->-> :
2 * .03 = 2.06 = ‘dt
20cm / 2.06s = 9.71cm/s = vAve
Vf = 9.71cm/s * 2 = 19.42
A = 19.42 / 2.06 = 9.43 cm/s^2
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• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
% error for vf = 2.9%
% error for a = 5.7%
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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: ->->->->->->->->->->->-> :
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• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
Acceleration changes at a different rate than velocity, twice as fast
You can see that 2.9 * 2 = 5.8 (nearly 5.7)
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