## WORK, ENERGY AND POWER

WORK Work is said to be done whenever a force moves a body through a certain distance in the direction of force. Work done can be defined mathematically as the product of the force and the displacement. It is a scalar quantity & measured in Joules W = F X d ……………………………………….1. W = mgh ……………………………………….2. If a force is applied on a body at an angle Ø to the horizontal Work done to move the body on the horizontal plane = Fcos Ø x d ……………………………..3. Work done to raise the body to an appreciable height = Fcos Ø x d ………………………4. Examples- A boy of mass 50kg runs up a set of steps of total height 3.0m. Find the work done against gravity Solution m = 50kg, h = 3m, g = 10m/s2 Work done = mgh = 50 x 10 x 3 = 1500 Joules Energy Energy… Read More »WORK, ENERGY AND POWER