1. The problem statement, all variables and given/known data Three blocks are in contact with each other on a frictionless, horizontal surface, as in Figure P5.54. A horizontal force F is applied to m1. Take m1 = 2.00 kg, m2 = 3.00 kg, m3 = 4.00 kg, and F = 22.0 N. (c)What is the magnitude of the contact force between m1 and m2? (d)What is the magnitude of the contact force between m2 and m3? http://img129.imageshack.us/img129/3048/p556ow4.gif [Broken] 2. Relevant equations f=ma 3. The attempt at a solution I'm clueless, as we haven't be taught anything about contact forces. Any help?