IB Physics A.4.3 Conservation of Angular Momentum Key Definitions

Angular impulse is a concept in rotational motion that describes the change in angular momentum of a rigid body due to the application of torque over a period of time.

Angular momentum is the rotational equivalent of linear momentum. More precisely, it is the product of its moment of inertia and its angular velocity.

Angular momentum is conserved unless an external torque acts on the system.

A rigid body is an idealized object in which the relative positions of all particles remain fixed, regardless of external forces or torques.

Torque is the rotational equivalent of force. It measures the ability of a force to cause an object to rotate.