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Homework Help: Pulley Question

  1. Jun 10, 2009 #1
    1. The problem statement, all variables and given/known data
    Mass m1= (25.70 kg) is on a horizontal surface, connected to mass m2= (5.90 kg) by a light string as shown. The pulley has negligible mass and no friction.
    A force of 241.7 N acts on m1 at an angle of 33.30 degrees. The coeficient of kinetic friction between m1 and the surface is 0.237. Determine the upward acceleration of m2.

    a picture of the problem and a partial explanation is given here: http://images.google.com/imgres?img...&sa=N&start=36&um=1&ei=TE8wSruPLaXYswO43JzWAw

    2. Relevant equations
    How do I find the acceleration?

    3. The attempt at a solution
    I found the horizontal component of the force pulling the masses. I know F=ma and that F(friction)=mu*normal force. But how do I use that? etc.
  2. jcsd
  3. Jun 10, 2009 #2


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    Homework Helper

    The acceleration of m2 = ( T - m2g)/m2.
    Frictional force = μ( Fsinθ + m1g )
    Applied force = Fcosθ - T
    Find the net force and acceleration of m1.
    Equate it with m2 and find T. Substitute it in one of the equation to get acceleration.
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