Question

If force is acting on a moving body perpendicular to the direction of motion then what will be the effect on the speed and direction of the body

Answer 1

HELLO THERE!

When force is acting on a moving body in perpendicular direction, Work done by the force will be zero, because W = F.S cos θ, where θ = 90, and cos 90 = 0, so W = 0.

So, there will be no change in the magnitude of velocity (or speed) of the body. However, the direction of motion of the body will be affected. The body will be forced to move in a circular path, because at all points of motion of the body, the perpendicular force is continuing to act on the body.

Hence, you can say that the velocity of the body will change, as velocity is a vector quantity, and is affected if either of magnitude or direction changes. The motion will now be accelerated, if the body was previously moving with uniform velocity.

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Answer 2

it will have no effect as

work = f x s x costheta

w = fs x cos 0

w=fs x0

w is 0

therefore it will have no effect

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