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Homework Help: A force F is shown acting on m, 2m and 3m, Find expression for the net force on 2m.

  1. Nov 14, 2012 #1
    1. The problem statement, all variables and given/known data
    Three masses m, 2m and 3m are placed on a horizontal surface. A force F is shown acting on m3. Assuming μs,k is the same between all of the masses and the horizontal surface, answer the following:
    a) Find the expression for the net force on the 2m mass.
    b) For F constant, μs,k =0 then the answer to (a) must decrease. Prove or Disprove.


    2. Relevant equations
    F=ma


    3. The attempt at a solution
    F=ma
    μs,k =m+2m+3m
     
  2. jcsd
  3. Nov 14, 2012 #2

    haruspex

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    Re: A force F is shown acting on m, 2m and 3m, Find expression for the net force on 2

    There appears to be a vital diagram missing.
    That makes no sense. The quantity on the left is a dimensionless coefficient, while that on the right is a mass.
     
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