G-force (with g from gravitational)
is a measurement of acceleration felt as weight. It is not a force, but a force per unit mass and can be measured with an accelerometer. Since such a force is perceived as a weight, any g-force can be described as a "weight per unit mass" (see the synonym specific weight). The g-force acceleration acts as a multiplier of weight-like forces for every unit of an object's mass, and (save for certain electromagnetic force influences) is the cause of an object's acceleration in relation to free-fall.
This acceleration experienced by an object is due to the vector sum of non-gravitational forces acting on an object's freedom to move. The accelerations that are not produced by gravity are termed proper accelerations, and it is only these that are measured in g-force units. They cause stresses and strains on objects. Because of these strains, large g-forces may be destructive.
