Question

Distinguish between positive and negative work. When you lift an object, two forces act on it. Identify these forces. Which one of the two does,

1 .positive work
2. negative work ? Justify your answer.
(CBSE 2012)​

Answer 1

Q. When you lift an object , two forces act on it ?

ans : When you lift an object , the two forces which act are both postitve and negative force.

Q. Distinguish between positive and negative work ?

ans: Positive work is said to be done when the force acting on a body produces a displacement in the direction of the force. Negative work is said to be done when the force acting on a body produces a displacement opposite to the direction of the force.