Question

When is the work done by a force on a body:

a) positive 

b) negative 

c) zero

Answer 1

Work done by a force applied on a body is: 

a) When the direction of motion of the body and the force acting in the same direction, work done is positive. 

b) When the direction of motion of the body and the force acting on the body are in the opposite direction, work done is negative. 

c) When the force is acting at a right angle to the direction of motion of the body, work done is zero.