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Determine the tension in each section of rope

  1. Feb 23, 2007 #1
    picture of problem:
    http://img.photobucket.com/albums/v223/lilaznbabe/4_56.gif [Broken]

    (a) What minimum force F is needed to lift the piano (mass M) using the pulley apparatus shown in Fig. 4-56? (Enter your answers in terms of some multiple of Mg.)
    ____ Mg (I got .5)
    (b) Determine the tension in each section of rope: FT1, FT2, FT3, and FT4.
    Tension in FT1?
    ____ Mg (I got .5)
    Tension in FT2?
    ____ Mg (I got .5)
    Tension in FT3?
    ____ Mg
    Tension in FT4?
    ____ Mg (I got 1)

    ok so i only need help on FT3...
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Feb 23, 2007 #2


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    the best you can do is approximate it by assuming all tension forces on the upper pulley act vertically. You've got the others correct, so why not continue in the same manner to solve for FT3 in the same manner using Newton 1?
    Last edited by a moderator: May 2, 2017
  4. Feb 23, 2007 #3
    i initially thought it was 1...but that is wrong, then i thought .5 but something tells me thats not right. :frown:
  5. Feb 23, 2007 #4
    what is causing the tension in #3?

    draw a FBD of the pulley with all the forces on it

    in order for this system to be in equilibrium the sum of the forces must be 0,

    so the forces up must equal the forces down
  6. Feb 23, 2007 #5
    yay!!!!!!! thanks soooo much i got it!
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