1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Problem related to Newton's Laws

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

    2. Relevant equations
    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
    T - 0 = m1 a

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted