Table of Contents If you have played cricket, you would have experienced that catching a ball which is moving with a higher velocity is more difficult than catching a ball which is moving with lesser velocity. Similarly, it is easier to catch a table tennis ball as compared to a cricket ball when both are dropped from the same height. Thus, we see that moving bodies postess a physical quantity associated with their motion which determine how much force is required to bring them to rest . This quantity which depends on the mass and velocity of the moving body is called momentum and is defined as momentum (p) = mass (m) × velocity (v) NOTE Since mass is a scalar and velocity is a vector, momentum is a vector quantity. If a body is moving along a straight path, the body is said to post linear momentum. Definition of momentum – The momentum of a system is conserved ( does not change) when there is no net external force. Units of Momentum SI unit of momentum is kg m s -1 or Newton ....