Question

when can we say that the work done is A positive B negative
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Answer 1

Answer:

I think A positive

Explanation:

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Answer 2

Work is vector i.e. along with magnitude direction also plays a vital role in determining it’s value and it could be positive, negative or even zero.

Considering the mathematical formula for Work = F.d(both vectors) it is said to be

(a) NEGATIVE when displacement of the body is in direction opposite to direction of force e.g. when a person lifts a weight then the displacement of the body is in direction opposite to Gravitational Force and thus it can be said that the work done on the body by gravity is NEGATIVE (angle between Gravitational Force and Displacement is 180 degree and cos 180 = -1).

{b) On the contrary ZERO work is said to be done when NET DISPLACEMENT of body = 0. It can happen when

net force on the body is zero

Same starting and terminating position of the body

displacement of body is in direction perpendicular to the force.

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