Question

A mass of 10 kg is travelling over a horizontal surface with friction and the coefficient of kinetic friction is 0.53. One additional force of 27 Newtons is applied to it in the +x direction (parallel to the surface). It slides 3 meters in the +x direction. What is the work done by the weight force in Joules?

Answer #1

are you sure the question statement is same as you posted???

Does the question really asks work done by the weight force ??

If so,

then work done by the weight force is zero,

Here is the reason

W = F*d cos (theta) where theta is the angle between force and direction of motion

Here the weight force acts downwards and the motion is in + c direction, means theta is 90 degree

cos 90 = 0

Therefore, W = 0

Note - No work is done along direction of motion if force is perpendicular.

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