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When an objects is moving it has a certain amount of velocity¸ So one would expect that when two objects of different mass are moving at the same velocity they would need the same amount of braking force to stop their motion¸ But this is not the case as can be observed in everyday life¸ In fact we can find out that moving at the same velocity the heavier object needs a greater braking force than the lighter object to stop¸ This phenomenon is called momentum¸ So‚ we say that the heavier object has got more momentum than the lighter object¸ The momentum of a body is defined as the product of its mass (in kg) and velocity (in m/s)¸