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 | HI WHAT IS A PULLEY :) | |
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| FRIST WITCH PULLEY TO BE EXACT :) | |
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| MMMM LET ME THINK O A SINGLE MOVABLE PULLEY :) | |
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| A SINGLE MOVABLE PULLY S A PULLEY THAT HALF THE EFFORT THAT NEED TO LIFT THE LOAD :) | |
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| WHAT IS THE MENAING OF EFFORT :) | |
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| EFFORT: IS THE AMMONT OF FOURCE IS NEEDED :) | |
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