Question

In the case of negative work, the angle between force and displacement is:

• A. 45 degree
• B. 0 degree
• C. 90 degree
• D. 120 degree

Answer 1

The correct option is D

120 degree

We know that, W=F $\times$ S $\times$ cos $\theta$, where F,S and $\theta$ are magnitude of force,displacement and angle between them respectively.

Here, work done depends on force, displacement and angle between force and displacement vector.

When the angle is obtuse, work done will be negative because the value of cos $\theta$ will be negative.