1. The problem statement, all variables and given/known data A horizontal force of 15 N pushes a .50 kg book against a vertical wall. The book is initially at rest. If the coefficient of static friction= 0.6 and the coefficient of kinetic friction = 0.40, what is the acceleration of the book? 2. Relevant equations F=ma static friction= coefficient of static friction x normal force kinetic friction= coefficient of kinetic friction x normal force 3. The attempt at a solution First, I drew a free body diagram of a rectangle next to the wall. To the right, I had the force 15 N pointing towards the rectangle (the force exerted on the book). To the left, I had a force - 15 pointing towards the rectangle (the force exerted on the book by the wall). Pointing in the down direction, I had a vector mg. In the upward the direction the force is equal to the frictional force. Thus, the force in the x direction equals 0. Ff-MG= MAy Thus, Ay= (Ff-MG)/M Ff= coefficient of kinetic friction * normal force For some reason, I'm not getting a good answer. Can someone tell me where I am going wrong? Thanks!