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AP Physics SHM Lab

PART 1: Periods of oscillating system.

A. The mass/spring system.

1. Obtain a spring with a known spring constant k, a ring stand,

and a motion detector.

2. Measure the period for 5 different masses.

3. On graph paper, plot T2 vs. m.

4. From your graph, obtain a value for k. Show all work

directly on your graph.

5. Get the % error between the known k and your value.

PART 1: Periods of oscillating system.

B. The simple pendulum.

1. Obtain a string, a spherical mass, and a photogate.

2. Measure the period for 5 string lengths, L.

3. On graph paper, plot T2 vs. L.

4. From your graph, obtain a value for g. Show all work

directly on your graph.

5. Get the % error between 9.8 m/s2 and your value.

1. Obtain a pre-drilled meter stick ( physical pendulum)with support.

2. Measure and record the mass of the meter stick, m, and the

distance from the pivot to the center of mass, h.

3. Measure and record the period of the oscillating physical pendulum.

4. Use your experimental period, T, the mass, m, and the distance h

to determine the rotational inertia of the pendulum.

5. Use the parallel axis theorem and the fact that Icm = (1/12)mL2 to

find the rotational inertia of the pendulum about the pivot point.

6. Compare your I’s found in part 4 and 5 with a percent difference.

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