Why work done is not zero when we climb up a staircase

Asked by  | 27th Apr, 2008, 03:44: PM

Expert Answer:

the formula for wrok done is

F d cosθ 

 when we apply force in the upward or downward direction(in case of opposing gravity) perpendicular to direction of displacement  90 degrees ,as in this example the angle bewteen the force and the displacement is 90 and cos90 is zero. hence work done is zero.

Answered by  | 23rd May, 2008, 12:46: PM

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