Question

when do we say that work is done? when is the work done by a force on a body ? (a) positive, (b) negative (c) zero





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Answer 1

Answer:

when is the work done by a force on a body positive negative and zero. Work is done positive when the force is applied on the body and it move in the direction of the force while neative force is said to be done when force and displacement is not in the same direction.

Answer 2

Answer:

Work is said to be done when a force applied to an object moves that object.

Work is done positive when the force is applied on the body and it move in the direction of the force.

Negative force is said to be done when force and displacement is not in the same direction.

Zero work is done when the displacement of a body is zero or perpendicular (θ=900,cosθ=0) to the direction of force applied, then work done is zero.

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