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Newton's laws multiple objects contact forces

  1. Nov 15, 2009 #1
    1. The problem statement, all variables and given/known data

    Three crates are arranged. Their masses are m1=29.8, m2= 15.3, m3= 27.3. The applied force of 910 N is directed horizontally and the coefficient of friction is u= .277

    WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M1 and M2?
    WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M2 and M3

    2. Relevant equations

    ?

    3. The attempt at a solution

    acceleration of the three masses = 9.85
     
  2. jcsd
  3. Nov 15, 2009 #2

    PhanthomJay

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    Your answer for the acceleration of all 3 blocks looks correct. What's the acceleration of each block? Answer that question and then draw free body diagrams of the blocks and use Newton's laws for each block.
     
  4. Nov 16, 2009 #3
    isn't the acceleration the same?
     
  5. Nov 16, 2009 #4

    PhanthomJay

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    yes, they are.
     
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