the driver thrown e in touch we would f the bus and the owever een the sudden ictional ur feet strictly s some parts go with ere it is ore we opens of the e body opens p due lative e bus move ward e into ally hip ta the ter hat Exert hall nal the grens is Momentum Momentum of a body is defined to be the product of its mass m and velocity v and is denoted by p 5 1 Momentum is clearly a vector quantity The following common experiences indicate the importance of this quantity for considering the effect of force on motion p mv Suppose a light weight vehicle say a small car and a heavy weight vehicle say a loaded truck are parked on a horizontal road We all know that a much greater force is needed to push the truck than the car to bring them to the same speed in same time Similarly a greater opposing force is needed to stop a heavy body than a light body in the same time if they are moving with the same speed If two stones one light and the other heavy are dropped from the top of a building a person on the ground will find it easier to catch the light stone than the heavy stone The mass of a body is thus an important parameter that determines the effect of force on its motion the mos Same Sper Speed is another important parameter tout heavy consider A bullet fired by a gun can easily pierce human tissue before it stops resulting in casualty The same bullet fired with moderate speed will not cause much damage Thus for a given mass the greater the speed the greater is the opposing force needed to stop the body in a certain time Taken together the product of mass and velocity that is momentum is evidently a relevant variable of motion The greater the change in the momentum in a given time the greater is the force that needs to be applied A seasoned cricketer catches a cricket ball coming in with great speed far more easily than a novice who can hurt his hands in the Ono raggon in that the cricketer allows a both Stone tene sequire force to stopte a light stone