Question

under what condition work done is zero

Answer 1

hii friend

work done:
work is said to be done when a force F acts on an object and object moves through a distance or there is displacement in the direction of the force.
i.e work done =F×S

work done can be zero when any of these things happen:-

1.) when the force applied is zero.
2.) when displacement is zero.
3.) if cos is 90° then work done is zero .
w=FScos

ex. -->a girl pushing a heavy rock.

hope this helps
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Answer 2

WORKDONE WILL ZERO WHEN THE ANGLE BETWEEN FORCE APPLIED AND DISPLACEMENT IS 90 DEGREE OR IF EITHER FORCE OR DISPLACEMENT IS ZERO OR BOTH ARE ZERO

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