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In this regard, what is ground effects on a car?

Ground effect (cars) In car design, ground effect is a series of aerodynamic effects which have been exploited to create downforce, particularly in racing cars. This has been the successor to the earlier dominant aerodynamic theory of streamlining.

Furthermore, who invented ground effect? Colin Chapman's

Moreover, why was active suspension banned?

Active suspension was in its infant stage, and they wanted to eliminate it before there was an expensive development race. So, they outlawed it and put that wooden plank at the bottom of the car. Theoretically, that is the lowest the car can go.

When was ground effect discovered?

Ground effect is downforce produced by cars' shaped undersides, and in the late 1970s and early '80s it dominated F1 thinking as well as went a long way to frame the competitive order. It was pioneered by Lotus and vastly increased grip and cornering speeds; therefore it was quickly adopted by the entire field.