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 right angle to the direction of motion of the body , work done is zero.