1. The problem statement, all variables and given/known data 2. Relevant equations F=m*a Fs <= N*us Fk = N * uk 3. The attempt at a solution b) T-fs = 120 T-.2 * 9.8 * (15 + 20 + 25) = 120 => T = 237.6 Newtons c) (Fs)2 on 1 = (Fs)1 on 2 = 15 * 9.8* .6 = 88.2 Newtons d) (15 + 20) * 9.8 * .6 = 205.8 Newtons e) This is where I'm falling apart. Since we are applying a larger tension force than the static friction of both top boxes, then the boxes must slide off. Right? f) My professor said they slide off at the same time, but I'm not sure how to show it, or why. I thought the top one would fly off first, since the static friction force is smallest. Any help is appreciated!