1. The problem statement, all variables and given/known data There are two blocks against a wall on a frictionless table. I can't really manage a diagram, so please imagine this. There are two blocks, one of 5 kg and another of 10 kg, against each other. The 10 kg one is touching the wall. The frictional coefficient between the two blocks is 0.2 A force of 200 N is applied to the 5 kg block. What is the reactional force? 2. Relevant equations Newton's laws and Frictional force = frictional coef. x Normal 3. The attempt at a solution Should it not be 200 N back? ( The ans. is 177) What role does the friction play here?