From Newtons second law it follows that if a constant force acts on a particle for a. It is a direct consequence of Newtons Third Law of motion. Rockets Are Perfect Examples Of The Law Of Conservation Of Momentum The Law Of Conservation Of Momentum States That In The Physics Photo Projects Conservation In Newtonian mechanics linear momentum translational momentum or simply momentum is the product of the mass and velocity of an object. . Or the general definition is. For a collision occurring between object 1 and object 2 in an isolated system the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collisionThat is the momentum lost by. Collisions are governed by Newtons laws. In general relativity energymomentum conservation is not well-defined except in certain special cases. Solved Problems on Law of Conservation of Momentum. Law of Conservation of Momentum.