1. Limited time only! Sign up for a free 30min personal 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!

Friction in a contact between a pulley and a string

  1. Nov 30, 2013 #1
    1. The problem statement, all variables and given/known data
    I need to find a formula for the friction in the system.
    I had a disk and a pulley connected to a rotation sensor on each side.
    I wrapped a pulley with a string and there was a small mass attached to the bottom.
    As I let that mass fall, it would fall and spin a pulley.
    What would be the formula for the friction in the system?

    *Given variables are T, Hanging mass, pulley radius, disk mass, disk radius, and angular acceleration

    2. Relevant equations
    Torque = I(mr^2)*(angular acceleration)
    Fnet = Fg-T-Ff

    3. The attempt at a solution
  2. jcsd
  3. Nov 30, 2013 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF;
    Does the string slip over the pulley?

    How is friction usually figured out?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted