Physics Dept. Demonstration Manual

DRD 02 - Angular Momentum, Rolling Ring and Disc


To illustrate the dependence of angular acceleration on the moment of inertia.

  • Inclined plane
  • Wooden disc
  • Metal ring


If the disc and ring are released together at the top of the plane, the disc will arrive at the bottom of the plane first since its moment of inertia (l/2 mr2) is half that of the ring (mr2). The disc and ring are of equal mass.


See also demonstrations DLD19 and DRD2.1.