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Blocks pushing on one another

  1. Oct 29, 2015 #1
    1. The problem statement, all variables and given/known data

    On a surface without friction, we have 3 blocs with mass A=0,4 kg B=0,1 Kg C=0,3 Kg which are placed one beside the other, with A being first, B second and C third.. If we push on the bloc A with a horizontal force of 2,4 N, determine what is the acceleration and what are the forces of the normals which are located between the blocs.

    http://imgur.com/F9PQwKK
    2. Relevant equations

    Sum force of x = m * a(x)
    3. The attempt at a solution
    I was able to resolve the problem and got the right answers. What I was wondering is why should I assume that the acceleration is going to be the same for the 3 blocs ? I was able to solve the problem because I assumed this to be true, but I don't know why it is. I guess that the fact there's no friction makes this true. any help ?
     
  2. jcsd
  3. Oct 29, 2015 #2

    BvU

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    Well, given the picture, B and C can't accelerate slower than A. There also is nothing that could make them accelerate faster.

    Does that answer your question ?
     
  4. Oct 29, 2015 #3
    Said this way, it makes sense. Ty
     
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