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!

Rotational Motion- Pulleys with Friction

  1. Oct 8, 2007 #1
    1. The problem statement, all variables and given/known data
    Two Masses are suspended from a pulley. The pulley itself has a mas of .20kg a radius of .15m a constant torque of .35 MN due to the friction between the rotating pulley and its axle. What is the magnitude of the acceleration of the suspended masses if m1= .4kg and m2= .8 kg (neglect the mass of the string)
    Pulley
    | |
    | |
    M2 M1




    2. Relevant equations
    T1= M1G - M1A
    T2= M2G + M2A
    Torque= FL = Moment of Inertia x Alpha,
    I= 1/2 mr^2

    3. The attempt at a solution
    I have tried solving this by solving for A when T2-T1= I alpha, but i really dont know how to apply the fact that the tension is different of both cords due to the friction on the pulley im stuck...
     

    Attached Files:

    • ph.JPG
      ph.JPG
      File size:
      4.1 KB
      Views:
      119
  2. jcsd
  3. Oct 8, 2007 #2
    I have tried everything... but still i cant get to the answer.. i get to the formula a=(m2-m1)g/(1/2M+m1+m2) but after that i dont know how to apply the torque... :( need help
     
    Last edited: Oct 8, 2007
  4. Oct 8, 2007 #3
    bump....
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Rotational Motion- Pulleys with Friction
Loading...