# While the moment of inertia was exactly the same the

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sensor. While the moment of inertia was exactly the same, the angular acceleration was much greater than in the first part of the experiment as there was less air resistance affecting the speed of the rotating rod. We used the same exact equation to compute our theoretical angular acceleration (alpha = mR p g/mR p 2 + I), yet this time we used a different pulley radius in our equation (values seen in tables 1.1.1 and 1.2.1). In the second part of the experiment we used a cylinder as the rotating rigid body (we were unable to also include a disc as there was no appropriate screw available that was long enough to attach both pieces to the pulley). Using the rotary motion sensor again, we computed our experimental alpha values. In this part of the experiment, however, we solved only for the experimental moment of inertia by using the same equation as earlier (alpha =
mR p g/mR p 2 + I), and solving for the experimental I. We had no theoretical moment of inertia to compare with our values. III: Procedure : There were a few deviations from the lab manual during this experiment. First, in 5.1 we used a rod with two point masses in two different trials—one with the point masses at the end of the rod and one with the point masses in the center of the rod. We only used one hanging mass of 0.03kg (instead of an additional hanging mass of 0.02kg). In 5.2, we were unable to use both a disc and a cylinder due to lack of laboratory equipment. We used only a cylinder as our rotating rigid body. IV: Data/Analysis : 5.1 Part One : In this part of the experiment, we used a rod with two point masses directly on the ends of the rod as our rotating rigid body. We used the rotary motion sensor to collect the experimental alpha data over five trials. We calculated the theoretical moment of inertia (0.000705 kg•m 2 ) and then plugged it into the following equation to solve for the theoretical value of angular