G-force is a measure of acceleration due to gravity. One G is the force of the Earth's gravity (the force that determines how much you weigh). In order to calculate G-force, you need to know the speed an object is moving at and the radius of the turns. Then you calculate the acceleration as follows: A = v2 /r. The amount of acceleration equals the velocity at which the object is moving, squared, divided by the radius of the turn.
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