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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

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

    How is friction usually figured out?
     
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