G forces are the measurement of the force that acts on a body during acceleration, deceleration, or turns. One G force is equal to the force of Earth's gravity, which is 9. 8 meters per second squared (m/s²). G forces are measured in multiples of this force and are expressed as a ratio to the body's weight. For example, a car accelerating at 2 Gs would experience a force of 19. 6 m/s². There are various ways to measure G forces, including accelerometers, strain gauges, and gyroscopes.