Question

when do we say work is done ? what is meant by positive work and negative work ?​

Answer 1

Answer:Work is said to be done when a force moves an object through a distance in its own direction.

Explanation: Positive work: when force and displacement are in the same direction, the work performed on an object is said to be positive work. ... Negative work: Negative work is performed if the displacement is opposite to the direction of the Force applied.

Answer 2

Answer:

When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work. Negative work: Negative work is performed if the displacement is opposite to the direction of the Force applied.