1. The problem statement, all variables and given/known data Block M1 is on top of block M2 which is on top of a horizontal frictionless surface. A horizontal force, F, is applied to M1. The coefficient of static friction is us and the coefficient of kinetic friction isuk. Find, a) the maximum force that can be applied to M1, such that the position of M1 relative to M2 will not change. (M1 will not slip on top of M2). Then, if the force acting on M1 is doubled, or F' = 2F, find the acceleration of each mass. 2. Relevant equations F=ma 3. The attempt at a solution I think i got part a correct, double check that for me, but im stumped on part b. if you are increasing the force, then now there is kinetic friction. would M2 (the mass on the bottom ) be moving at all? wouldnt the acceleration be 0 because there is so much applied force that it would overcome the static force. also do we assume that the second applied force (twice the size of the first one) is applied after the first one is applied or do we disregard the first force completely? part a is done in the first image, and I started part b by drawing the free body diagram in the second picture.