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course PHY 241
1/09/20122:02 am
Ball Drop
You dropped a ball from a measured and/or estimated height and estimated the time required for it to drop.
Insert a copy of your data here, along with any previously submitted work you wish to include:
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Estimated Meter
Trial One: 0.45 seconds
Trial Two: 0.43 seconds
Trial Three: 0.47 seconds
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What do you think was the percent uncertainty in the measurement of height?
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maybe around 10%, as I was eyeballing it.
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What do you think was the percent uncertainty in the measurement of the time of fall?
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maybe 1%. The increment was very small, but I was using a stopwatch.
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A 1% uncertainty would correspond to .005 seconds, i.e., 5 milliseconds. There is no way a hand-held stopwatch could time an interval between two events with an undertainty of 5 milliseconds (i.e., 1/200 of a second).
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What were the average velocity and, assuming acceleration to have been uniform, the acceleration of the falling ball?
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average velocity: 0.47 m/s
Average acceleration: 0.22 m/s^2
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You didn't report the height from which the ball was dropped. Your result should be obtained based on the time of fall and the distance of the fall.
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The acceleration you report would follow from your stated average velocity and the reported time intervals; however the average velocity seems way too low.
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Based on your uncertainty estimates for time of fall and height, what is the percent uncertainty in the acceleration as you observed it?
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5.5%
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