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Homework Help: Tension of strings problem

  1. Mar 3, 2010 #1
    Tension problem!!

    1. The problem statement, all variables and given/known data
    Consider a force F = 887 N pulling 3 blocks
    of masses m1 = 9 kg, m2 = 16.9 kg, and
    m3 = 26.1 kg along a frictionless horizontal
    surface.
    The tension of the strings are T1 and T2 (see
    sketch).
    The equation of motion of m2 is given by
    1. T1 − T2 = m1 a .
    2. T1 − T2 = m2 a .
    3. T1 = m2 a .
    4. T1 − T2 = (m1 +m3) a .
    5. T1 + T2 = m1 a .
    6. T1 = (m1 + m3) a .
    7. T1 + T2 = m2 a .
    8. T1 = m1 a .
    9. T1 + T2 = (m1 +m3) a .


    2. Relevant equations

    F=ma

    3. The attempt at a solution
    T1 = m2a
    T2 = m3a
    When I try to solve through substitution, I don't get any of the choices above.
    What do i do next?
     

    Attached Files:

  2. jcsd
  3. Mar 3, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: Tension problem!!

    Net force acting on m2 is T1 - T2.
     
  4. Mar 4, 2010 #3
    Re: Tension problem!!

    Divide the force by all of the masses combined (m1+m2+m3) and this will give you the acc.

    Just FYI for the first part of the problem
     
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