1. 11.7   Angular Momentum
Figure shows a particle of mass m with linear momentum as it passes through point A in an xy plane. The angular momentum, of this particle with respect to the origin O is a vector quantity defined as:
The direction of the angular momentum vector is given by the right-hand rule. It is perpendicular to the plane formed by the position and linear momentum vectors.
SI unit of angular momentum = kg · m2/s = J.s

2. 11.8/9   Newton’s Second Law
The (vector) sum of all the torques acting on a particle is equal to the time rate of change of the angular momentum of that particle.

3. 11.10 The Angular Momentum of a Rigid Body Rotating About a Fixed Axis

4. 11.11 Conservation of Angular Momentum
If the net external torque acting on a system is zero, the angular momentum of the system remains constant, no matter what changes take place within the system.

5. 11.11 Demonstration on Conservation of Angular Momentum

6. Angular Momentum in Sports
The springboard diver.
Long jump.