Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 82.0 m and the coefficient of friction is 0.39?

Answer 1

You must be refering to the coefficient of STATIC friction, Us, which determines the force at which slipping begins.

Solve this equation for Vmax:

M*Vmax^2/R = M*g*Us

Note that the mass M cancels out.

Vmax = sqrt(g*Us*R)