Question

Distinguish between positive and negative work.

Answer 1

	Positive work	Negative work
1.	When the displacement of the body is in the direction of the force then the work done is positive.	When the displacement of the body is in the opposite direction to the direction of the force then the work done is negative.
2.	The angle between the direction of force and displacement must be $0°\le \theta <90°$	The angle between the direction of force and displacement must be $90°<\theta \le 180°$
3.	Example: Work done by pull or push force.	Example: Wok done by frictional force or braking force.