To show that the moment of inertia of a torsional pendulum is directly proportional to the period of oscillation. A torsional pendulum consists of a long rod that hangs off the end a thin wire. Adjustable weights can be slid apart to increase the moment of inertia and the period of oscillation is observed.
Torsional pendulum is stored in mechanics.
Use a screwdriver to adjust the weights. Set it up with a table rod and clamp. There is a screwdriver in the above photo because it must be supplied with this demo.