1. Rotational Inertia and the Parallel-Axis Theorem Pre-Lab Purpose To confirm: 1.The rotational inertia of a disk can be calculated using the models derived in class. 2.The rotational inertia about a parallel axis a perpendicular distance h from the center of mass can be found using the Parallel-Axis Theorem.

2. Rotational Inertia and the Parallel-Axis Theorem Pre-Lab The clamp-on Super Pulley must be adjusted at an angle, so that the thread runs in a line tangent to the point where it leaves the 3-step Pulley and straight down the middle of the groove on the clamp-on Super Pulley (Figure 1.2).

3. Rotational Inertia and the Parallel-Axis Theorem Pre-Lab Since the masses are accelerating downward. Since the string doesn’t slip, the linear acceleration of the masses is equal to the tangential acceleration of the outside of the pulley.

4. Rotational Inertia and the Parallel-Axis Theorem Pre-Lab Newton’s Second Law Experimental Rotational Inertia