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Homework Help: Newtons Third Law Involving three objects

  1. Apr 13, 2015 #1
    1. The problem statement, all variables and given/known data
    Three boxes, A, B, C, are positioned next to each other on a friction-less surface, an applied force acting on box A causes all the boxes to accelerate at 1.5 m/s/s. Calculate the force exerted by box C on box B. ma= 8 kg mb=10 kg mc= 5 kg

    2. Relevant equations

    3. The attempt at a solution
    10.0 kg(1.5 m/s/s)-5.0kg(1.5m/s/s)=FNet

    I am unsure if I am right
  2. jcsd
  3. Apr 13, 2015 #2


    Staff: Mentor

    First step, try drawing a free body diagram.

    Second compute Fnet which is moving the three masses at 1.5m/s/s.
  4. Apr 13, 2015 #3
    Maybe you could explicitly define your terms?

    I would recommend to do a free body diagram for each of the following:
    1) the entire block a+b+c system
    2) block a by itself
    3) block b by itself
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