Question

when is the work done bi a non zero force acting on a particle with displacement negative and zero ​

Answer 1

zero when Force is prependicular to displacement or no displacement a boy lifting a bag and moving horizontally or a boy pushing a wall

negative when force is opposite to displacement in case of throwing ball work gone by gravity is negative

Answer 2

Work done by an object.

Explanation:

The work done by an object is given by the product of mass and displacement. It is given by :

$W=Fd\cos\theta$

If $\theta=0$, $W=Fd$, work done is positive.

If $\theta=90^{\circ}$, W = 0 Joules. The work done by the object is 0.

If $\theta=180^{\circ}$, W = -Fd. The work done by the object is negative.

Hence, we can say if the force and the displacement are perpendicular to each other, then work done is 0 and if the force and displacement are acting in opposite direction, work done will be negative.

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Work done

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