(C) The work done $W$ is defined as the dot product of force $\vec{F}$ and displacement $\vec{S}$:$W = \vec{F} \cdot \vec{S} = F S \cos \theta$where $

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$\vec{F}$ and $\vec{S}$ are mutually perpendicular.

(C) The work done $W$ is defined as the dot product of force $\vec{F}$ and displacement $\vec{S}$:$W = \vec{F} \cdot \vec{S} = F S \cos \theta$where $\theta$ is the angle between the force and displacement vectors.For the work done to be zero $(W = 0)$,we must have $\cos \theta = 0$.This occurs when $\theta = 90^{\circ}$.Therefore,the force $\vec{F}$ and displacement $\vec{S}$ must be mutually perpendicular to each other.

Class 11 Physics Work, Energy, Power and Collision Work Done by Constant Force

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If $\vec{F}$ and $\vec{S}$ are force and displacement respectively,and the work done by them is zero,then:

A
$\vec{F}$ and $\vec{S}$ are in opposite directions.
B
$\vec{F}$ and $\vec{S}$ are in the same direction.
C
$\vec{F}$ and $\vec{S}$ are mutually perpendicular.
D
$\vec{F}$ is greater than $\vec{S}$.

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Work, Energy, Power and Collision

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Work Done by Constant Force

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If $\vec{F}$ and $\vec{S}$ are force and displacement respectively,and the work done by them is zero,then:

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If force and displacement of a particle in the direction of force are doubled,the work done would be:

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