Question

define work and give its formula. give some examples situation where work said to be done

Answer 1

In physics, a force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force. For example, when a ball is held above the ground and then dropped, the work done on the ball as it falls is equal to the weight of the ball (a force) multiplied by the distance to the ground (a displacement).

W = F ⋅ s

Good examples of opposing force include drag due to interaction with an air mass and the force due to friction between two objects.