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!

Homework Help: 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook