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Homework Help: 2 blocks

  1. Dec 17, 2014 #1
    1. The problem statement, all variables and given/known data
    A hand pushes on block A. Block B is on the right side of block A. If block a has A mass of 20kg and block B has a mass of 12 kg, and the acceleration equals 4m/s^s, what is the force that block B exerts on Block A

    2. Relevant equations

    3. The attempt at a solution
    F=20kg/4m/s^2 but I am not sure if this, in which I used the mass for block A, is it or if i have to use block B mass. I am kind of confused on which one
  2. jcsd
  3. Dec 17, 2014 #2


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    Homework Helper

    The force that block B exerts on block A is the same as the force that block A exerts on block B (that's one of newton's laws).

    You could find this force by evaluating the forces for either block A or block B, but it would be easier to analyze block B.

    What are all the forces acting on block B? What is the net force on block B? ([itex]F_{net}=ma[/itex])
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