Question

A car is traveling at 9 m/s in a circle that has a radius of 60 m. what must be the minimum value of μ for the car to make the turn without skidding?

Answer 1

$$F_c=F_{fr},$$ $$\dfrac{mv^2}{R}=\mu mg,$$ $$\mu=\dfrac{v^2}{Rg},$$ $$\mu=\dfrac{(9\ \dfrac{m}{s})^2}{60\ m\times9.8\ \dfrac{m}{s^2}}=0.14$$