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This lab was designed to prove the gravity constant.  We let the "pendulum" (just a weight on a string, hanging from the ceiling) sway back and forth ten times.  We timed how long this took and divided by ten to find the period T of one pendulum swing.  We also measured the distance from the ceiling to the middle of the wieght.  We then plugged this into the eqation T = 2psqrt L/g.  Using these numbers, most of us got a number 9.7-9.9.  Since the gravity constant is 9.8, our results were pretty good