Linear momentum is a conserved quantity that describes how the motion of an object depends on its mass and velocity. The impulse-momentum theorem is another relationship that puts an additional constr...Linear momentum is a conserved quantity that describes how the motion of an object depends on its mass and velocity. The impulse-momentum theorem is another relationship that puts an additional constraint on how a system evolves in time. Conservation of momentum is useful for understanding collisions in which it is just as powerful, just as important, and just as useful as conservation of energy and the work-energy theorem.
