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Accelerating Masses

  1. Jan 29, 2016 #1
    1. The problem statement, all variables and given/known data

    WP_20160129_22_41_47_Pro.jpg
    2. Relevant equations
    a= (m2g)/(m1+m2)

    3. The attempt at a solution
    Which is option 4.
    But the answer doesn't match
     
  2. jcsd
  3. Jan 29, 2016 #2

    Doc Al

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    Staff: Mentor

    Show how you got your answer.
     
  4. Jan 29, 2016 #3
    The formula for acceleration here is:
    m2g/(m1+m2)
    So shouldn't that be the answer?
     
  5. Jan 29, 2016 #4

    Doc Al

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    Staff: Mentor

    Why do you think that is the formula? How did you derive that?
     
  6. Jan 29, 2016 #5
    For m1:
    T=m1a
    the normal reaction force in the upwards direction = m1g
    For m2:
    m2g-T=m2a
    so,
    m2g-m1a=m2a
    m2g=m1a+m2a
    so acceleration = m2g/(m1+m2)
     
  7. Jan 29, 2016 #6

    Doc Al

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    Staff: Mentor

    Note that the acceleration here is the horizontal acceleration.

    Here the acceleration is the vertical acceleration. (What must that equal?)
     
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