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law of conservation of matter - a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system. conservation of mass, conservation of matter, law of conservation of mass. conservation - (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations.
The law of conservation of momentum states that the total momentum of a closed system does not change. This means that when two objects collide the total momentum of the objects before the collision is the same as the total momentum of the objects after the collision.losed system is used to mean that only the forces of the two objects colliding affects the motion of the objects. See Newton's third law of motion. If another force (called an external force) affects the motion of the objects then the momentum is not conserved, it will change.