Procedures
_(All experiments were carried out on August 22, 2013.)
![Picture](/uploads/2/2/8/9/22893520/4112941.png?345)
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Step #1: First I attached the bobs of the pendulums. I tied 10 paperclips on the ends of each of the three strings. The mass and weight of the bobs were constant, even though they wouldn't affect the period.
![Picture](/uploads/2/2/8/9/22893520/1981231.png?433)
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Step #2: Next, I measured the length of each string starting at the end of the bob. The lengths of the pendulums were 5, 10 and 15 inches long.
![Picture](/uploads/2/2/8/9/22893520/7782560.png?414)
_Step #3: Before I cut the strings, I also made sure to add an extra inch to each string. This way I would be able to tape the pendulums up without affecting their lengths.
![Picture](/uploads/2/2/8/9/22893520/1322231.png?277)
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Step #4: After that, I taped the strings to a rod and measured them again to be sure they were the correct length.
![Picture](/uploads/2/2/8/9/22893520/2824830.png?322)
_Then I carried out the trials. I made sure to keep the displacement at a constant 90 degree angle, even though it wouldn't affect the pendulum's period.
![Picture](/uploads/2/2/8/9/22893520/4502737.png?429)
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Step #5: For the final step,
I measured the periods of the pendulums using a very accurate online stopwatch. I had 3 trials for each pendulum and carefully recorded my observations in my notebook.