Answer to Question #155867 in Mechanics | Relativity for Pijus

Question

What are the necessary conditions for mechanical work?

Answer 1

A mechanical work is done only if these two conditions are satisfied:-

1.There must be net displacement.

2.A force must be applied in such way that angle between force and displacement is never equal to 90°.

Since

$$W=F•d•cos\theta$$

Where W is work done ,F is force and d is displacement.