1. The problem statement, all variables and given/known data Part C of problem Please see attachment : What is the minimum horizontal force needed to keep the book from slipping. Note that P=515N, and P=normal force, Fs=131.32N, Us=.255, M=9.85kg 2. Relevant equations Fn=(m*g)/Us 3. The attempt at a solution My answer is 378.549N, which makes no sense becasue in the previous part my force of static friction was 131.32N. PLease help!!!!!