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System of pulleys - General Understanding

  1. Sep 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A person is pulling the cable with force T. Find T.
    [PLAIN]http://img684.imageshack.us/img684/1959/drawing6pulleys.jpg [Broken]

    2. Relevant equations
    Equilibrium Sum of forces y = 0

    3. The attempt at a solution

    This is what I did:
    [PLAIN]http://img822.imageshack.us/img822/7789/drawing6pulleyspart2.jpg [Broken] The last part should say T=W/4
    The answer (T=W/4) is the same at the end of the book but I want to make sure this is the correct way to approach pulley system problems, meaning: separate each pulley, do Sum of forces on each and give the proceeding cable force the same force as the force held bythe previous cable that it's connected to, and if it's coming straight from the ceiling it just has force T? Is this a correct approach?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 14, 2010 #2


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    Homework Helper

    You are right.
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