1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Pulley system question

  1. Feb 24, 2015 #1
    1. The problem statement, all variables and given/known data
    Hi Guys,

    I am looking at a simple movable pulley system like the one two in from the left. I am trying to work out the relationship between the force applied to the free end (called F2 in the picture) and the tension in the cable

    2. Relevant equations


    3. The attempt at a solution 450px-Four_pulleys.svg.png

    I think that you add the tension in each section of cable so then 2F = T, the tension in the cable is double the force F2 but I'm not sure. Is that correct?

    Thanks!
     
  2. jcsd
  3. Feb 24, 2015 #2

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    But the tension in the cable is given in the figure. F2 equals ____?
     
  4. Feb 25, 2015 #3
    The tension is 50N so then F = T, as it is for all the options here. Does that mean that F always = T?
     
  5. Feb 25, 2015 #4

    Merlin3189

    User Avatar
    Gold Member

    "Does that mean that F always = T?"
    What do you mean? What is F? And what is T?
    Depends what F is and what T is. Here FL certainly doesn't equal the tension in the rope.

    When we assume the rope is light and frictionless (which of course it never is!), then the tension in the rope is the same at all points.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Pulley system question
Loading...