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17 September, 13:26

A handle or knob is fixed at free end of door. why?

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  1. 17 September, 16:14
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    This is because of something called moments,

    moment is the turning Effect of a force.

    it is calculated by

    moment=force*perpendicular distance from the line of action.

    So if there is more distance from pivot the more the moment is for the same force.
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