What does it mean by 85% of a simple machine? The velocity ratio of single movable pulley always 2,why?
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It means that 85% of input work is utilized to do work and remaining 15% is lost due to friction and heat energy.
Because in a single movable pulley load is supported by two segments of string. It makes the effort distance double of the load distance.Due to this, VR of single movable pulley is always two.
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