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Homework Help: Modified Atwood's Machine

  1. Nov 19, 2008 #1
    1. The problem statement, all variables and given/known data

    Given the system shown, if the pulley has frictionless bearings, find
    a, the magnitude of the acceleration of the masses.

    This is a modified Atwood's machine, instead of the 2nd mass hanging however, it is stationary on a table. The pulley is at the edge of the table and the 1st mass is hanging down. The mass on the table has a mass of 3kg, the hanging mass is 4kg. The pulley has an I of 1/2 kg*m^2 and a radius of .3m.

    2. Relevant equations

    F = Ma
    T = Ia(angular)
    T = r x F

    3. The attempt at a solution

    F = Ma
    Mg - T2 = ma
    also Torque = r x F
    Torque = rTsin90
    RT = Ia(angular)
    rT = I (A/R) --> because linear accel = angular * radius

    But from here I'm lost...
  2. jcsd
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