What is work done by a person carrying a load of 10 kg on his head and moving along the platform by a distance of 4 metre?
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Answer:10x9.8x4 =...joule
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Work done by a person, walking on level road with load on his head, on the load is zero.
2. Work done = Force x displacement
W = F.s = Fs cos θ
where θ is the angle between the direction of force and the direction of displacement of the object. If they are perpendicular to each other θ = 90°. We have cos 90° = 0. Therefore
W = Fxsx0 = 0
though he does work against force of friction
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