A car can negotiate a curved road at a greater speed when the road is banked compared to when it is flat. The reason for this is that:

banking increases the coefficient of friction
banking increases the radius of the curve
the normal reaction provides a horizontal component that adds to the centripetal force
on a banked track the weight of the car acts down the slope

Correct answer: the normal reaction provides a horizontal component that adds to the centripetal force

Solution

When the road is banked, the normal reaction is no longer vertical; its horizontal component contributes to the centripetal force needed for circular motion, allowing higher safe speeds.

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