This apparatus is designed to measure the inertia in rotational motion for different bodies. Whenever a body rotates at any angular velocity, inertia produces. The unit consists of a large disc and a small pulley. Inertia of three different bodies can be calculated by this apparatus.
1. Rod and point masses
2. Hoop (Drum)
The body whose inertia is to be calculated is placed on the disc. The disc is then rotated with the help of a cord which is tied to the disc and passed over the small pulley. The cord has hanger and weights on its free end.