1. The problem statement, all variables and given/known data To test the performance of its tires, a car travels along a perfectly ﬂat (no banking) circular track of radius 331 m. The car increases its speed at uniform rate of at ≡ d|v|dt = 3.68 m/s^2 until the tires start to skid. If the tires start to skid when the car reaches a speed of 27.8 m/s, what is the coefficient of static friction between the tires and the road? The acceleration of gravity is 9.8 m/s^2. 2. Relevant equations F = ma(subscript c) = m(v^2/r) us = F/N 3. The attempt at a solution I am Physics dummy, but I tried doing (27.8 m/s)^2 / 331 m. I tried to find the F of it. But I got all confused, I don't know what I am doing anymore. Can someone help? Please.