Question

give two necessary conditions without which work is not said to be done in science. also define 1 joule work​

Answer 1

Answer:

The two necessary conditions without which work is not said to be done are -

1. The displacement should not be zero.

2. The angle between the displacement and the force vectors should not be 90°. Since work is given by Fscosθ and cos 90° = 0, work done becomes 0. Therefore, the angle between the force and the displacement vectors should not be 0°.

1 J work is defined as the work done when 1 N force produces 1 m displacement