## Moment of Inertia of a 3D Filament Reel About Its CM

*Introduction*

Your school can put all of those empty 3D filament reels to good use in the physics classroom. There's a good chance that you and your students could come up with some interesting physics lab investigations using these reels. As shown in Figure 1, attach Voyager or PocketLab One to the reel, and the possibilities are endless! This lesson describes a lab in which your students determine the moment of inertia of an empty 3D filament reel about its center-of-mass. They will accomplish this using two independent methods. One method has the reel acting as a p