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Homework Help: Hanging Block Inclined plane

  1. Sep 27, 2010 #1
    1. The problem statement, all variables and given/known data

    An 18kg cart is connected to a 12kg hanging block at the bottom of the incline (ignore friction)

    What is the magnitude of acceleration of the cart?

    2. Relevant equations


    3. The attempt at a solution

    well without the hanging weight i calculatoed the force parallel to the plane to be 101.2 N
    and the force perpendicular to the plane is 144.5 N
    I tried adding the X force (101.2N) to the downward force of the weight on the pulley (176.4 ) and then dividing by the total masses. But I can never get the right answer its supposed to be 7.3 m/s*2 but I don't know how its obtained.
  2. jcsd
  3. Sep 27, 2010 #2
    can anyone help?
  4. Sep 27, 2010 #3


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    Gold Member

    Try drawing a free body diagram of each block. What forces act on each?

    Then use the fact that [tex]\Sigma \vec{F} = m\vec{a}[/tex] to find the net acceleration.
  5. Sep 28, 2010 #4
    yes i tried that and i dont know do i add the fg of the hanging block to the Fx of the block on the plane?
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