Question

When is the work done by a force on a body positive negative and zero?

Answer 1

when the force acted upon a body accelerates the motion and velocity or the rate then the force is said to be positive but if it retards it then the negative force is applied to it respectively

Answer 2

To Find :

When is the work done by a force on a body positive negative and zero .

Solution :

We know , work done is given by :

$W=Fd\ cos\ \theta$

Here , $\theta$ is the angle between F and d .

So , work done will be negative when F and d are in opposite direction .

Work done will be positive when F and d are in same direction .

And, work done will be zero when F and d are perpendicular to each other .

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Work Done

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