Circular Motion on a Banked Surface
When a car is travelling on a banked surface, if it does not slip, this is due to the force of friction acting at the wheels. Suppose the car moves in a horizontal circle of radius r with a speed v. The forces acting on the car are shown in the diagram below.
Resolving vertically gives us (1)
Resolving horizontally gives us (2)
For the car not to slip,sohence