G-force, or gravitational force, is a measure of acceleration. One g is the force per unit mass due to gravity at the Earth's surface and is the standard gravity, defined as 9.80665 meters per second squared. It is a measure of the force of gravity experienced by a body, often expressed as a multiple of the standard gravitational acceleration on Earth. For example, an object at rest on Earth's surface is subject to 1 g, which is equal to the conventional value of gravitational acceleration on Earth, about 9.8 m/s^2
. High g-forces can have significant effects on the human body, such as causing tunnel vision or loss of consciousness
