1. The problem statement, all variables and given/known data The surfaces of two blocks are roughened so that they do not slide against each other when a force of 30N is applied to the bottom block. 1.Find the force of friction between the two blocks. 2. Find the minimum coefficient of friction needed between the two blocks so that the top block does not move. 2. Relevant equations Fnet = ma muK = Fk/Fn mu s = Fs,max/Fn 3. The attempt at a solution I found the acceleration of the two block system, which is 2 m/s². I'm wondering if you have to find the Fn of the 5kg block then act as if it was moving 2m/s² by itself over the 10kg block then determine Fk from that and plug it into muK = Fk/Fn. Thanks for any help!