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Homework Help: Contact forces?

  1. Feb 9, 2008 #1
    1. The problem statement, all variables and given/known data

    Three blocks are in contact with each other on a frictionless, horizontal surface, as in Figure P5.54. A horizontal force F is applied to m1. Take m1 = 2.00 kg, m2 = 3.00 kg, m3 = 4.00 kg, and F = 22.0 N.

    (c)What is the magnitude of the contact force between m1 and m2?

    (d)What is the magnitude of the contact force between m2 and m3?

    http://img129.imageshack.us/img129/3048/p556ow4.gif [Broken]

    2. Relevant equations


    3. The attempt at a solution

    I'm clueless, as we haven't be taught anything about contact forces. Any help?
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Feb 9, 2008 #2
    First you need to calculate the acceleration of the system because acceleration of all masses are the same. Next you can draw an FBD and use F=ma to solve c) and d)
  4. Feb 9, 2008 #3
    I calculated acceleration of the system to be (22/9)m/s^2.

    Would it be F=(m2-m1)a?
  5. Feb 10, 2008 #4
    for C) draw an FBD for M2
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