Question

How a body moves when net work done is zero stackexchange?

Answer 1

By moving to the same point again.

For example,
If a body moves from Point A to Point B,travelling a displacement of m,

Work Done(1) = F × Displacement = F × m

Now,if the same body moves from B to A,

Let us assume that force is same.

Work Done(2) = F × (-m) = - F × m [Displacement is negative as it travelled back, a vector quantity]

Net Work Done = W(1) + W(2)

= ( F × m ) - (F × m) = 0

Net Work Done is Zero.

But the body was moved from one place to another, besides the net work done is zero.

-WonderGirl

Answer 2

hey there !!

Let a body of mass "m" and 'F' force is acting on it and work(W) done is zero so ,

mathematically,

=) W = 0

=) F.S = 0 ( WORK = F.S)

=) FS = 0

SO , F is acting on it so it Can't be zero therefore S = 0

displacement is zero

so F = ma

therefore, a = F/m

so , body is moving with acceleration , a = F/m , if the work done is zero ..

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Hope it will help u