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No Work is Done by a Man Moving on a Horizontal Road While Carrying a Box on His Head. Explain. - Physics

Short Note

No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.

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Solution

The displacement of the man and box is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 900;
Thus, W = Fd cos 900 = 0
Hence, no work is done against gravity in this case; however some work is done against friction.

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APPEARS IN

Frank ICSE Class 10 Physics Part 2
Chapter 1 Force, Work, Energy and Power
Exercise 1.4 | Q 29 | Page 38
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