A car travelling in a straight line is approaching a corner. As the driver turns the steering wheel, the car begins to swing around the corner.
We know that an object in motion tends to travel in a straight line unless acted upon by a force.
The force that makes the car turn is the friction between the car tyres and the ground. If the friction is reduced by oil or water on the ground, then it may not be great enough to provide the centripetal force and then the car will not turn but carry straight on!
If there is a passenger in the car, he too will tend to carry straight on as the car turns the corner. But friction between him and the seat provides a centripetal force to make his direction of travel circular.
Picture Credit : Google