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Sir Isaac Newton describes force as equal to momentum with respect to time. A force is a push or a pull on an object. Momentum is the movement of an object in one direction and its tendency to stay moving in that direction. Newton has described the relationship of momentum and force in his laws of motion. There are three laws of motion, but his second law is important in understanding momentum and its relationship to acceleration, which involves force! To maintain the momentum of a body, one must exert a force forward on the object equal to any forces acting opposed to the movement of the object.