• Used for demonstration only, no measurements are intended.
  • Demonstrates basic concepts of conservation of angular momentum through visual observation.


  • Bench top apparatus for clearly demonstrating the basic concepts of conservation of angular momentum.
  • To comprise of a bench mounted vertical board with a rotating arm, and two sliding weights.
  • The weights can be moved radially along the rotating arm by a cord.
  • The arm is spun manually.
  • Comprehensive technical manual.
  • 1x thread

Scope of Delivery

  • 1 experimental unit
  • 1 thread
  • 1 instruction manual

Conservation of linear momentum is often well understood by students but its demonstration is essential to further increase the understanding of this phenomena. For this reason, this apparatus is designed. This apparatus will also help students understand the importance and application of conservation on angular momentum in structural engineering and mechanics. This apparatus
consists of a rotating bar which has two dead weights which are attached to the opposite ends of the bar. The bar is attached to a vertical base though bearings. When the weights have a large radius, the rotation of the rod is minimum, alternatively, when the radius of attached weights is small, then rotation of the rod will be maximum. This is happening as conservation of linear
momentum is occurring. Although, this apparatus cannot conduct meaningful experiments, just some basic ones, but it provides striking visual and dramatic effects of the basic experiments. To explain the setup of the apparatus, a bench mounted stand has a bearing mounted rotating arm along which two weights can be moved by a pull cord operated by the student or demonstrator. The weights are moved to the outer ends of their travel, away from the center of rotation. The arm is then spun rapidly by hand, and the weights are pulled towards the center by the cord.