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Homework Help: Mechanical motion help!

  1. Feb 22, 2009 #1
    1. The problem statement, all variables and given/known data

    blocks with masses of 1kg,2kg,3kg are lined up touching on a frictionless table. All three are pushed by a 12N force being applied to block 1(1kg).

    how much force does the 2kg block exert on
    a) the 3kg block?
    b) the 1kg block?

    2. Relevant equations[/b

    F=MA

    3. The attempt at a solution
    A=F/M = A=12N/1kg= an acceleration of 12. for the 1kg block.
     
  2. jcsd
  3. Feb 23, 2009 #2

    tiny-tim

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    Welcome to PF!

    Hi jade76! Welcome to PF! :smile:
    Nooo … the 1kg block also has force on it from the 2kg block.

    Hint: all the blocks have the same acceleration :wink:

    so the equation for that acceleration is … ? :smile:
     
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