question_answer

(a). If a force acts perpendicular to the Action of motion of a body, what is the amount of  done? (b). A body is moving at constant speed over a frictionless surface. What is the work done by the weight?

Answer:

                (a). The work done is zero because there is no Placement in the direction of force. (b). Work done by the weight is zero, since the force and the displacement are at right angles to each other.