Phy 231
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.
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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: ->->->->->->->->->->->-> :
vAve=10cm/s vf=20cm/s acceleration=5cm/s^2
acceleration is `dv/`dt, not vAve / `dt
#$&*
• If the time interval is in error so that it is 3% longer than the actual time interval, then what are the actual values of the final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
vf=19.4cm/s acceleration=4.7cm/s^2
vf found by doubling vAve and acceleration found by dividin vAve by time interval
#$&*
• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
3 percent for vF and 6 percent for acceleration
Due to the acceleration using the time interval twice it double the error
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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: ->->->->->->->->->->->-> :
not the same
#$&*
• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
Due to the acceleration using the time interval twice it double the error
#$&*
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15mins
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6/21 1145
Good, but be sure you're using the correct definition of acceleration. Your percent error was good, but your accelerations were not calculated correctly.
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#