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Pulley system

  1. Sep 12, 2009 #1
    Is it easier to pull up or down to lift a weight on a single pulley systeM?

    Thanks

    MB
     
  2. jcsd
  3. Sep 12, 2009 #2

    russ_watters

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    Staff: Mentor

    The force required is the same.
     
  4. Sep 12, 2009 #3
    Hmm. Well, I was given and A and B answer so, it has to be one or the other. I was thinking it was lifting (A) since the force to pull (B) seems to require more force. I could be wrong. I really don't know the answer.
     
  5. Sep 12, 2009 #4

    russ_watters

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    Staff: Mentor

    Err, I think I got an incorrect picture in my head of what is going on (which is why it helps to have a diagram!) If the "pull down" scenario is just a rope looped over a pulley, whereas the "pull up" scenario has a pulley on the object, there is a mechanical advantage in the second scenario and thus it is easier to pull up.
     
  6. Sep 12, 2009 #5
    Thanks Russ, that was my guess too. Pull up vs pull down. Thank you!
     
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