1. The problem statement, all variables and given/known data In order to hold a book of mass m stationary against a wall, you must push horizontally with a force of at least P. a. make a force diagram and find the coefficient of static friction b. calculate the coefficient of static friction for the wall and book when at least a 35-N horizontal push is needed to hold a 1.2-kg book steadily at rest against the wall. 2. Relevant equations F=ma F_n=mg F_f=μF_net 3. The attempt at a solution I find it difficult to grasp the concept that, somehow, there is still friction between the wall and the book even though there is no velocity. My best guess would be: F_f = F_net so μ would have to equal 1. help would be greatly appreciated.