PUlleys,,,,,

vayntraubinator

Full Member
7+ Year Member
May 28, 2011
510
3
  1. Pre-Health (Field Undecided)
    Can someone please explain them and make them easy?

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

    http://mcat-review.org/force-motion-gravitation.php#analysis-pulley-systems

    http://en.wikipedia.org/wiki/Pulley

    399px-Pulley2.svg.png


    Thanks :)
     

    kkentm

    Full Member
    10+ Year Member
    Oct 3, 2008
    57
    0
      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)
       
      About the Ads

      Majik

      Full Member
      Jul 19, 2011
      91
      2
        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).
         
        This thread is more than 10 years old.

        Your message may be considered spam for the following reasons:

        1. Your new thread title is very short, and likely is unhelpful.
        2. Your reply is very short and likely does not add anything to the thread.
        3. Your reply is very long and likely does not add anything to the thread.
        4. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
        5. Your message is mostly quotes or spoilers.
        6. Your reply has occurred very quickly after a previous reply and likely does not add anything to the thread.
        7. This thread is locked.