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Reducing force in pulleys

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May 2, 2008
  1. Pre-Medical
So is the force always going to be the same in a pulley machine? Do we only take into account pulleys that directly act on the weight you're trying to pull?

No, the force decreases on each pulley as the number of pulleys increase. Like in my 40 N example, the 4 pulleys each have a tension of 10 N in their ropes. However, if you only had two pulleys, they each would have 20 N tensions in their ropes. Take all the pulleys that are contributing to lifting into account.
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