A car moving on a horizontal road may be thrown out of the road while taking a turn:

By the gravitational force
Due to lack of sufficient centripetal force
Due to friction between road and the tyre
Due to reaction of earth

Correct answer: Due to lack of sufficient centripetal force

Solution

A car taking a turn requires centripetal force directed toward the center of the curve. If the available frictional force is not enough to supply this centripetal force, the car skids outward and may be thrown off the road.

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