can you please tell me why work done is called zero if a coolie having load and walking.?

Asked by  | 23rd Nov, 2008, 07:47: PM

Expert Answer:

In order to balance the balance the load on his head , the coolie applies a force on it in the upward direction, equal to its weight. His displacement is along the horizontal direction. Thus, the angle between force F and displacement is 90o. Therefore, work done   W = FS Cos 90o = 0 . ( since Cos 90o = 0 ) .

Answered by  | 25th Nov, 2008, 01:20: PM

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