Sarthaks Test
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Calculate the work done by the frictional force in pulling a mass of 50 kg for a distance of 100 m on a road. The limiting coefficient of friction for road is, μ8 = 0.2.

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Given; m = 50 kg;
μ8 = 0.2, d = 100 m
The limiting friction force

 Work done W = Fd cosθ
The angle between frictional force and displacement
θ = 180°
cosθ = cos 180° = -1
And F = fs = 100 N
∴ The work done by force of friction
W = Fd cosθ = 100 × 100 x(-1)
or W=-104 j
Angle between force applied F and displacement,
0 = 0°
∴ cos0 = 1
∴ W = 100 × 100 × 1 = 104 J
or W = 104 J

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