When a car runs it experiences confrontation from the atmospheric air. Some of the power generated by the engine is used in neutralizing this resistance and does not contribute to force the car. When the car runs at high speed it also experiences an upward force which has to be countered so that the car can retain its firm grip on the road. A car spoiler helps in opposing both the aforementioned adverse reactions. A car spoiler is a sort of rear wing which improves aerodynamics of a car. In simpler words it would mean that it improves airflow over the car by reform it to some extent. You would have noticed rear wing like accessories in a racing car which are quite important.

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