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?
20cm / 2s = 10cm/s
10cm/s * 2 = 20cm/s
20cm/s – 10cm/s =10cm/s / 2s =5cm/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?
2s * 3% = 0.06
20cm/s – 0.06=19.94cm/s
5cm/s – 0.06=4.94cm/s
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• What is the percent error in each?
0.06
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• If the percent error is the same for both velocity and acceleration, explain why this must be so.
Because when one changes the other does too.
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• If the percent errors are different explain why it must be so.
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15 min
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Solution
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