ELi5 : is it practically possible to make work done negative?if yes what are some examples of it

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If the displacement is in a direction opposite to the force?

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You can have negative work just like you have negative acceleration.

Negative work is just the removal of energy from a system, where positive work is adding energy to a system.

One example of this is block dropping with an attached spring. The string is generating an upwards force on the block, but the blocks displacement is downwards.

W = F dot s =|F|*|s|*cos(theta)

In this case, theta is pi (or -pi) radians. cos(pi) = cos(-pi) = -1. Since the magnitudes of F and s MUST be positive (magnitudes are always positive) this implies that the work done is negative.

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