Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Belt & Pulley Question

  1. Nov 16, 2011 #1
    Hi guys,

    I am working on a simple belt and pulley question, as pictured below.

    4a7b0128.jpg

    To find the magnitude, I used the following equation:

    (g(M-m))/(M+m)

    So,

    9.81(2500-600)/(2500+600) = 6.01 - Answer = 6kN

    Is this correct, or am I doing it totally wrong? I have searched for the same question but didn't find any like this with a single pulley, all other examples seem to show 2 pulleys.

    Any help would be greatly appreciated.
     
  2. jcsd
  3. Nov 16, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    I don't understand that expression. Where did you get it? (Are m and M masses?)

    In any case, why not just find the net force on the pulley due to the belt tension? Add up those tension forces vectorially.
     
  4. Nov 16, 2011 #3
    Yes, they are masses. That's a formula I found via Google.

    How would you attempt the whole question?
     
  5. Nov 16, 2011 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Masses of what? How is that relevant?
    Do as I suggested in my last post.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook