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state three conditions for which work done is zero

Following are the three conditions for work done to be zero:

1. Net force applied is zero.

2. Net displacement is zero.

3. Force and displacement are perpendicular to each other.

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1. Positve work
2. Negative work
3. Zero work

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i think there is only one condition where the work done is zero. Work is done is zero when the angle between the force and displacement is 90o . Which as follow :

When force and displacement makes some angle then we take it as cos theta and if it is making 90o then 

Work Done = F x cos 90 x s 

                     = 0 x Fs ( cos 90 = 0)

 Work done = 0

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