This document contains instructions for a physics lab experiment on moment of inertia. The experiment has two parts: Part I measures the moment of inertia of a disk by applying a torque from a hanging mass and measuring the angular acceleration. Part II measures the moment of inertia of a rod with two movable masses by varying the mass positions and amounts and again measuring angular acceleration from a hanging torque source. Equations are provided to calculate moment of inertia from experimental measurements.