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Constant Torque Find magnitude of friction force

  1. Oct 24, 2009 #1
    1. The problem statement, all variables and given/known data
    A grinding wheel of radius 0.330m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 72.1 N*m. Find the magnitude of the friction force.

    I'm honestly lost at even starting this problem but below are some equations that I THINK are relevant but I don't really know.

    2. Relevant equations

    torque=I alpha, where I = 1/2MR^2.

    This is where I get confused because we are not given a mass.............


    3. The attempt at a solution
     
  2. jcsd
  3. Oct 24, 2009 #2
    Nevermind... silly me. Much simpler than I thought.
     
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