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Problem related to Newton's Laws

  1. Mar 23, 2013 #1
    1. The problem statement, all variables and given/known data
    34t2ycw.jpg


    2. Relevant equations
    ƩF=0
    ƩF= m a


    3. The attempt at a solution
    Since there is no friction do I assume the objects will move?
    or it will remain equilibrium since m1 is 120N which is way higher than 50N.
     
  2. jcsd
  3. Mar 23, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Why would the weight of m1 matter? (The mass of m1 matters though.)

    Note that m1 moves horizontally while m2 moves vertically.
     
  4. Mar 23, 2013 #3
    m1:
    T - 0 = m1 a

    m2:
    m2g - T = m2 a

    I need now to calculate acceleration first in order to get the value of the tension

    T = m1 a
    -T + m2g = m2 a

    [m2g = a(m1+m2)]
    50 = a(12+5)
    a= 50/17 = 2.94 m/s^2


    Now to calculate the tension
    T= m1 a
    T= 12 (2.94) = 35.3 N

    My question is, are the steps in red color right?
     
  5. Mar 23, 2013 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Yes, using a value of g = 10 m/s^2.
     
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