Time interval between every other block as the period

time interval between every other block as the period. Verify that this is so.
5. Now you can perform a trial measurement of the period of your pendulum. Pull the mass to
the side about 10º from vertical and release. Click and measure the period for five
complete swings. Click . Click the Statistics button, , to calculate the average period.
You will use this technique to measure the period under a variety of conditions.
Part I Amplitude
6. Determine how the period depends on amplitude. Measure the period for five different
amplitudes. Use a range of amplitudes, from just barely enough to unblock the Photogate, to
about 30º. Each time, measure the amplitude using the protractor so that the mass with the
string is released at a known angle. Repeat Step 5 for each different amplitude. Record the
data in your data table.
Part II Length
7. Use the method you learned above to investigate the effect of changing pendulum length on
the period. Use the steel ball and a consistent amplitude of 20º for each trial. Vary the
pendulum length in steps of 10 cm, from 1.0 m to 0.50 m. If you have room, continue to a
longer length (up to 2 m). Repeat Step 5 for each length. Record the data in the second data
table below. Measure the pendulum length from the rod to the middle of the mass.
Revised 2015 by Jacki Omland Physics with Computers

Pendulum Periods
Part III Mass
8. Use the 5 different drilled balls 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