Question

1. Condition for negative work done is a) 0 0° b) S0 c) 0-180° d) 0 90°​

Answer 1

180°

Work done can be positive,negative and zero. When a body is being lifted in the upward direction, the force of gravity is acting in the downward direction. But, the displacement of the body is in the upward direction. Since the angle between the force and displacement is 180 degrees, the work done by the gravitational force on the body is negative. Diagrammatic representation is given.Hence for negative work done, angle between force and displacement is 180

Negative work is performed if the displacement is opposite to the direction of the Force applied. Example: Work was done the gravity on a rocket going perpendicular upwards

Answer 2

Answer:

c) is your correct option.

Explanation:

as we know -ve work done is only possible when angle between force and displacement is 180°

as we know

W=Fd cos 180

W=-Fd