Question

The work done by a force is zero when.

Options:

1.displacement is zero

2.Force is normal to the displacement

3.Both the above

4.None of the above​

Answer 1

• Zero work is done when the displacement of a body is zero or perpendicular (θ=900,cosθ=0) to the direction of force applied, then work done is zero.

Answer 2

Since,

Work done = Force × distance

If displacement is zero

Then, distance is also zero

Therefore,

Work done = (force × 0) J

= 0 J

So,

The work done by a force is zero when displacement is zero.

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