a 2:1 purchase, as in a block and tackle purchase, is an expression which indicates the power enhancing capabilities of the system. A 2:1 doubles your input, minus some small percentage for friction. friction gets to be more of a factor the more turning points in the system.
check here http://en.wikipedia.org/wiki/Block_and_tackle for info with pics for a better explanation, especially about rigging tackle to advantage/disadvantage and theeffects of friction on the system
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