G-Force is acceleration expressed as a multiple of the acceleration due to gravity, used to describe the cornering, braking and acceleration loads a vehicle generates. One g equals about 32.2 feet per second squared, so a car sustaining 1.0 g of lateral acceleration is generating a sideways force equal to its own weight. Because the figure is normalized by weight, it is directly comparable between vehicles of different mass, which is why lateral g on a skidpad and braking g from a given speed are the standard measures of grip. Vertical g at the wheels matters too, since a suspension’s job is keeping the tire loaded through surface inputs, and combined lateral and longitudinal g plotted together produces the friction circle that shows how completely a driver is using the available grip.