Question

two balls on a frictionless surface collide and stick.what effect does it have on momemtum ,angular momemtum ,kinetic energy and mass?which of them is not conserved?

Answer 1

Such collisions are called inelastic collisions in which law of conservation of linear momentum holds good bu the total kinetic energy of colliding bodies is not conserved . In the case given in the question it is an example of perfectly in elastic collision .The reduction of total kinetic energy is equal to the total kinetic energy before the collision in a center of momentum frame with respect to the system of two particles, because in such a frame the kinetic energy after the collision is zero. In this frame most of the kinetic energy before the collision is that of the particle with the smaller mass. In another frame, in addition to the reduction of kinetic energy there may be a transfer of kinetic energy from one particle to the other

Answer 2

thanks