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Posted by on Wednesday, March 7, 2012 at 10:31pm.

When you want to pull downward to lift something, the main advantage of passing a rope upward and through a single pulley,rather than just up over the branch of a tree ,is that the pulley?

  • physics - , Wednesday, March 7, 2012 at 11:09pm

    The pulley has much less friction than a rope sliding over a branch, so less force is required to lift the object.

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