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course Phy 201
8/3 6
PhET Explorations: Pendulum LabPlay with one or two pendulums and discover how the period of a simple pendulum depends on the length of the string, the mass of the
pendulum bob, and the amplitude of the swing. It’s easy to measure the period using the photogate timer. You can vary friction and the strength
of gravity. Use the pendulum to find the value of g on planet X. Notice the anharmonic behavior at large amplitude.
Figure 16.15 Pendulum Lab ( http://cnx.org/content/m42243/1.4/pendulum-lab_en.jar )
I experimented with this pendulum for about 30 minutes, adjusting the length, mass, friction and gravity. It was evident that changing the mass has no effect on the pendulum. To find the gravity on Planet X, I used the equation T= 2pi*sqrt(L/g) and solved for g. Since this equation only works for small amplitudes, I set the angle to 3 degrees. G= L/(T/2pi)^2 = 2m/(2.3582s/2pi)^2 = 14.2m/s^2
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Good.
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