Turn Table Apparatus
Apparatus can experimentally determine the Moment of Inertia of a Disk a Ring and even asymmetrical objects in rotational motion. This is designed to provide a simple, clean means of studying rotational dynamics.
The simple geometry makes calculating the moment of inertia easy, so that the calculated values can be verifed by experiment. One can apply a torque to a rotating turntable by applying tension to string wound around an axis of the turntable. Hanging a mass from the string, over a pulley, creates the tension. The mass is allowed to drop, vertically, and thus accelerates. The linear acceleration of the mass is the same as the linear acceleration of the string, and thus of a point on the axis of the turntable. That linear acceleration of the mass is related to the angular acceleration of the apparatus by a factor of the radius of the axis cylinder. We can measure the angular acceleration of the rotating platform with help of mass and stopwatch. The moment of inertia can be varied through a wide range.
This permits good, accurate, reproducible measurements using only a scale, a stop watch, and mass balance.