1. The problem statement, all variables and given/known data Two blocks with masses m1 and m2, m2>m1, are attached, I push from the left and from the right side, which force is bigger? The surface is frictionless. http://imagizer.imageshack.us/v2/800x600q90/194/wkft.png [Broken] 2. The attempt at a solution I think it's bigger when applied from the left because of the reaction of m2 is bigger than the reaction of m1 because m2>m1, but I don't know any equations to corroborate it.