Methods of momentum

This is true for rigid as well as non rigid body. Differentiating the above expression with respect to the time

Integrating the above relation between t₁ and t₂ ,

Note that all external forces exert impulses, whether they do work or not.

Angular Momentum:

Angular momentum is defined as the moment of linear momentum.

For a system of particles, the angular momentum H_G (about the mass center) is given by