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Homework Help: Frictionless Multiple Body Problem with Inclined planes

  1. Oct 28, 2014 #1
    1. The problem statement, all variables and given/known data
    4-p-077-alt.gif An m1 = 7.6 kg block and an m2 = 10.7 kg block, connected by a rope that passes over a frictionless peg, slide on frictionless incline. Find acceleration of boxes and tension of the rope.

    2. Relevant equations
    I'm not sure what else

    3. The attempt at a solution
    I'm really not sure where to start... I drew a free-body diagram and resolved the perpendicular/parallel components of each weight vector. Do I find the net of those two forces? How does tension work? (that concept still confuses me in general)
  2. jcsd
  3. Oct 29, 2014 #2


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    Tension acts as a force pulling the block towards the rope and, equally, the string towards the block.
    You are not given a mass for the rope, so assume it is negligible. This means that despite the rope's accelerating the net force on it is effectively zero. This means you can assume the tension is the same at both ends of the rope.
    Please post the equations you have from your FBDs. Try to assign unique symbols to each different force etc.
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