Question

According to the law of conservation, "Momentum of a system is always conserved when there is no net external force on the system." But there is always an externet net force acting on an object which is the Weight of an object. So how is it possible?

Answer 1

Angular momentum is conserved when the effect of external forces acting on it is zero . If body has weight than it also has equal and opposite reaction so the resultant force is zero .