What is force? Have you ever picked the hail stones falling down in a hail storm? A paper boy throws a newspaper. Have you ever wondered about this action. Actions like stretching a rubber band, pulling a rickshaw, rowing a boat etc. , are some examples where our efforts help to change of the objects. Such actions like picking , squeezing , twisting , stretching , lowering and lifting etc., cause a change in the state of an object. Now let us try to group these tasks as a pull or a push