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Momentum Consider an example-when there happens a collision between moving train & bus , then nothing happens to train and bus gets totally crushed , why? Also, when train halts at the station, then it takes some time to do that. But it is not true for bus . Why? Because of high mass of train. Thus, by seeing above examples we can say that heavier bodies (like train) takes some time to bring it's velocity to zero when brakes are applied though train and bus are moving with the same velocity. Therefore,to describe the motion of body , not only velocity is considered but mass is also taken into account. The total quantity of motion possessed by a moving body is known as the momentum of the body. It has both magnitude and direction and hence a vector quantity.it is denoted by p. magnitude of p=mv Where m is mass of body v is velocity of body Now let us see the law of conservation of momentum | ||