Colloquialism for the effect that acceleration, cornering and braking has on a vehicle or its occupants.

The inertial force exerted upon drivers as the car changes direction. One G is equal to the force of gravity. Inertia causes a moving object to try and keep the same speed and direction of travel. Any change in direction creates some amount of G Force. There are six directions of G Force: left/right, front/back and up/down. High-speed corners exert more G force on drivers than do very slow corners due to the additional grip provided by downforce as speeds increase, but braking, acceleration and rises or drops in the pavement also create Gs.

The apparent increase in weight of an object due to gravitational forces. That way, drivers are pushed backwards when accellerating and pushed to the left of the car when turning right and the other way around.

Positive G is an increase in effective weight [bottom of a loop] and Negative G is a decrease in effective weight, as when a body tends towards weightlessness at the top of a loop.