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A. In a single fixed pulley system (below left), the force to load ratio is 1:1. In other words, the force pulling down on one side equals the force pulling up on the other side. In a single movable pulley system (below right), the force to load ratio is 1:2, or a given force balances twice the load.
(If you have these two scenarios in more, um, inclusive pictures, please send.)
from Five Triangles http://ift.tt/1JAXx5H
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