# So that the mass with the string is released at a

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so that the mass with the string is released at a known angle. Record the data in your data table. Part II Length 7. Investigate the effect of changing pendulum length on the period. Use the 200 g mass and a consistent amplitude of 10º for each trial. Vary the pendulum length in steps of 10 cm, from 50 cm to 100 cm (measure the pendulum length from the rod to the middle of the mass). If you have room, continue to a longer length (up to 200 cm). Repeat Step 5 for each length. Record the data in the data table for Part II. Add additional rows to the data table. Part III Mass 8. Use the three masses to determine if the period is affected by changing the mass. Measure the period of the pendulum constructed with each mass, taking care to keep the distance from the ring stand rod to the center of the mass the same each time, as well as keeping the amplitude the same. Repeat Step 5 for each mass, using an amplitude of about 10°. Record the data in the data table for Part III. DATA TABLE Part I Amplitude Amplitude (°) Average period (s) 10 1.9826 15 1.9718 20 1.966 25 1.981 30 1.9924 Part II Length Length (cm) Average period (s) 65 1.61 75 1.7332 85 1.864
Computer 14 95 1.94324 105 2.02632 115 2.56684 Part III Mass Mass (g) Average period (s) 26.1 1.9 52.6 1.914 78.6 1.916 104.5 1.921 ANALYSIS 1. When measuring the pendulum period, should the interface measure the time between two adjacent blocks of the Photogate? Or is some other measurement logic used? Why?
14 - 4 Physics with Vernier 2. Disconnect the sensors and choose New from the File menu. Create a graph of the pendulum period, T , vs . amplitude in degrees. Scale each axis from the origin (0,0). Does the period depend on amplitude? Explain.
Pendulum Periods
Physics with Vernier 14 - 5