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Rotational Inertia equation help

  1. Jun 4, 2012 #1
    1. The problem statement, all variables and given/known data

    Derive the equation for the linear acceleration of a falling mass m suspended by a string from the rim of a uniform disk of mass M and radius R that is free to rotate without friction about its principal axis.

    2. Relevant equations

    a=rα
    linear acceleration = radius*angular acceleration

    Torque=inertia*angular acceleration
    3. The attempt at a solution

    I don't really understand the question. If something is in free-fall, isn't its acceleration g? I just don't understand where the variables for the masses go. Any help is appreciated..
     
  2. jcsd
  3. Jun 5, 2012 #2
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