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Acceleration of block/pulley system

  1. Oct 25, 2011 #1
    1. The problem statement, all variables and given/known data
    What is the acceleration of the 2.0 block in the figure across the frictionless table?
    Hint: Think carefully about the acceleration constraint.
    I've attached the diagram.

    2. Relevant equations
    F=ma


    3. The attempt at a solution
    A=1.0kg block
    B=2.0kg block
    For block A: mAa1=2T
    0=-Fg+n
    For block B: mBa2=T-Fg
    and no forces in x direction

    So I assume the tension is equal because it is the same string. I also assume that the accelerations are different for the blocks though I'm not completely sure what to assume/why. All I really need is an explanation as to what I should know about the acceleration and why that is.
     

    Attached Files:

  2. jcsd
  3. Oct 25, 2011 #2

    PeterO

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    Homework Helper

    That pulley system means that B will move half as much as A. half the distance, half the speed, half the acceleration.
     
  4. Oct 25, 2011 #3
    Oh okay, that makes sense. Thanks a lot!
     
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