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The law of conservation of matter states that matter can neither be created nor destroyed. If an environmental process is observed carefully it is able to account for the matter at any point in time. It does not mean that the form of the matter does not change, nor for that matter the properties of the matter.
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.