Legend

 ac = centripetal acceleration v = velocity r = radius Fc = centripetal force m = mass FN = normal force Ff = force of friction

The car experiences centripetal acceleration and at the same time is kept in place without sliding by friction.

Level Curves

 When we release an object swung in a circular path, it takes a net force (the resultant of all forces) acting inward that keeps the object spinning in a circle; if you let go, the net force is no longer inward, so the object flies outward.For example, If a car travelling around a level curve.  Where does the net force acting toward the center of the curve come from?  Static friction.  So Newton's 2nd law for this situation is determined as follows: F = ma and, static friction, assuming car is not skidding Ff = FN = mg Centripetal acceleration: ac = v2/r In this situation, Ff = F mg = ma = mac = mv2/r Therefore: g = v2/r As a result, we see that the greater the of the road is, the faster a car can travel without skidding.  And the car can travel in a small radius of a curve without skidding.
 Circular Motion Banked Curves