Full Member
7+ Year Member
May 28, 2011
  1. Pre-Health (Field Undecided)
    Can someone please explain them and make them easy?

    Im just so confused as to whats going on...




    Thanks :)


    Full Member
    10+ Year Member
    Oct 3, 2008
      theres no real explanation for it, you just need to develop an intuition of pulley systems where you can visually assess the tension forces. in this case the weight of the mass is evenly distributed over the pulley system in such a way that the tension at the 3 points indicated are all W/3 (upwards)
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      Full Member
      Jul 19, 2011
        It might help in realizing that for a rope, tension is the same everywhere along it. Each time the rope pulls upwards, there's a force/tension applied in the upward direction. This upward force is countered by the weight of the object. Assuming you're pulling at constant velocity, which is the case most of the time, then the net force = 0N.

        If Fnet = 0, then weight = Tension 1 + Tension 2 + Tension 3

        Earlier I said these tensions are equal, so instead I should say that:

        Weight = 3T (where T = tension in rope).
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