A torsion pendulum consists of a disk or bar suspended from a wire or rod, which twists about its axis. When the disk or bar is displaced from its equilibrium position and released, it oscillates with a period that depends on the torsional constant of the wire and the moment of inertia of the disk or bar. By varying the mass or its distribution, one can observe changes in the oscillation period, demonstrating the effect of the moment of inertia on the period of a torsional oscillator. This setup highlights the dependence of rotational motion on the distribution of mass relative to the axis of rotation.