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PENDULUM Featuring the PENDULUM Gravity Lab Presentation by David Bang Jessamyn Hung Mandy Lin Jennifer Yoon SWINGING WITH GRAVITY

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NEWTON’S LAW OF GRAVITY

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Determine the value of gravity (g) as accurately as possible. OBJECTIVE

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Why did we choose to use the pendulum? How does the pendulum relate to gravity? PROCEDURE : REASONING

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Is it possible to measure gravity using a pendulum? HYPOTHESIS If gravity puts force downwards on the pendulum, we should be able to calculate gravity using the time of one period.

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STEP ONE: CREATING MODEL PROCEDURE : TRIAL & ERROR What were the errors for our first trial? How did we improve? Left: Trial 1 Right: Final Trial

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PROCEDURE : EXPERIMENT What tools and equipment did we use? Which applications and programs helped our process?

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STEP TWO:EXPERIMENT PROCEDURE : EXPERIMENT

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STEP TWO:EXPERIMENT RESULTS: RECORDED DATA Did having multiple trials help make more accurate results?

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 1107.9.79.6241 2108.0.8.64 3108.0.8.64 4107.9.79.6241 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 156.4.64.4096 256.5.65.4225 356.3.63.3969 456.3.63.3969

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 13011.51.151.3225 23011.21.121.2544 33011.41.141.2996 43011.01.101.21 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 1209.7.97.9409 2209.6.96.9216 3209.8.98.9604 4209.8.98.9604

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 15015.71.572.4649 25015.11.512.2801 35015.31.532.3409 45015.91.592.5281 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 14013.31.331.7689 24013.51.351.8225 34013.11.311.7161 44013.51.351.8225

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 17017.81.783.1684 27017.71.773.1329 37017.51.753.0625 47017.71.773.1329 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 16016.21.622.6244 26016.11.612.5921 36016.31.632.6569 46016.51.652.7225

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 19019.71.973.8809 29019.31.933.7249 39019.21.923.6864 49019.31.933.7249 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 18018.71.873.4969 28018.41.843.3856 38018.31.833.3489 48018.21.823.3124

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TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 111021.52.154.6225 211021.52.154.6225 311021.82.184.7524 411021.92.194.7961 TrialLength (cm)Time (sec) for 10 swings Period (T)T2T2 110020.42.044.161 210020.22.024.080 310020.32.034.1209 410020.42.044.161

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STEP TWO:EXPERIMENT RESULTS: RECORDED DATA Finding out the value of “g”: Formula: = Where did the formula come from?

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What were the factors that affected the accuracy of our experiment? ASSUMPTION & LIMITATIONS What were our thoughts throughout the process?

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Our hypothesis was correct! Using the time of one period, we were able to calculate a measurement of gravity. Our final result for gravity was CONCLUSION 9.77 / 2

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