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Homework Help: Frictionles force problem with hanging mass

  1. Mar 1, 2010 #1
    1. The problem statement, all variables and given/known data
    A block if mass M1=3.70 Kg on a frictionless plane inclined at 30 degrees is connected by a cord over a massless, frictionless pulley to a second block of mass M2= 2.30Kg. What is the magnitude of acceleration of both blocks?

    2. Relevant equations

    3. The attempt at a solution



    Not really sure where to go from here since I have 2 variables T and a.
  2. jcsd
  3. Mar 1, 2010 #2


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    your geometry/trig is off, it's not the sin function here...
    you are missing a force component in this equation
    ..or is it M2g -T = M2ay?? Or does it matter?
    2 equations, 2 unknowns..are the accelerations of the masses the same?
  4. Mar 1, 2010 #3


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    Since M2*g > M1*g*sinθ, M2 moves in the downward direction.
    Now write down expression for net force on M1 and M2.
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