Question

In which situation is no work considered to be done by a force?

Answer 1

If the angle is either 0 or 180, that means that there is either negative or positive work, so A and D are not correct.

If the angle is 45, then there is still some work involved.

The only option where there is no work done by a force is B. when the angle is between the force and displacement is 90. 

Answer 2

Answer:

The correct answer is option B.

Explanation:

Work done is defined as product of applied force to an object and displacement that is distance covered by an object when force applied.

$W=Force\times distance\times \cos\theta$

• When $\theta =0^o or 180^o$. positive or negative work will be done.
• When $\theta =45^o$ s, some amount wok will be done
• When $\theta =90^o$ no work will be done.