1. The problem statement, all variables and given/known data What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 29 km/h and the coefficient of static friction between tires and track is 0.29? 2. Relevant equations coefficient of static friction = (f of maximum static friction / Normal force) fnet = ma = m * v^2 / r 3. The attempt at a solution If an object is moving, isn't their just kinetic friction? I get that the normal force is the acceleration, but how can there possibly be a maximum static friction at this point? Here's what I've got: 29km/h = 8.0556 m/s .29 = fstatmax / a, therefore a = fstatmax / .29 Fnet = m* a = m * (v^2 / r) Fnet = a = v^2 / r fstatmax / .29 = (8.0556)^2 / r Thanks for any help!