What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?

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Solution

Work is defined as the product of force, displacement, and cosine of the angle between them.
It is a scalar quantity.
Its S.I unit is joule.
Work done by the force is given by the following formula.
$W = F . S . C o s \emptyset$
where F= Force
S= Displacement
∅ = Angle between the force and displacement
Since Cos90⁰ = 0 and so the work done will be zero.
Hence, if the angle between force and displacement is 90⁰, the work done will be zero.

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