Irodov Probem 1.196

Let there be n particles in the system with masses m1,m2,...,mn. Let their position vectors with respect to O be the vectors r1,r2,...,rn and their velocities be the vectors v1,v2,...,vn. Thus, we have,






The position vector of the particles with respect to point O' will be r1-r0,r2-r0,...,rn-r0. So the angular momentum of the system of particles with respect to point O' will be,










Clearly if p=0, the angular momentum will not be altered.