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Mathematics 8 Online
OpenStudy (anonymous):

how does the cable system on a weight machine make rasing the weights easier

OpenStudy (anonymous):

work done by someone pulling on the ropes must equal change of energy raising the load, and work done = force times distance. by using pulleys the ropes move a distance a couple of times more than the load does so the force required to pull on the ropes is less than if you were pulling directly.

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