1. The problem statement, all variables and given/known data What is the greatest acceleration that can be generated by a runner if the coefficient of static friction between shoes and road is 0.95? 2. Relevant equations Fnet = ma Force of static friction: usN Weight= mg 3. The attempt at a solution FBD: Positive x axis is to the right. Positive y axis is to the top. Normal force pointing up, equal in magnitude to weight pointing down. Friction must point in the positive x direction. f = max ax = usg amax = (0.95*9.81) = 9.3 m/s2 I just have one question. Does the friction force point to the right, in the direction of the positive x axis? Thanks!