Such forces cause stresses and strains on objects, since they must be transmitted from an object surface. In practice, as noted, these are surface-contact forces between objects. The g-force experienced by an object is due to the vector sum of all gravitational and non-gravitational forces acting on an object's freedom to move. Gravitational acceleration is one cause of an object's acceleration in relation to free fall. The types of forces involved are transmitted through objects by interior mechanical stresses. When the g-force is produced by the surface of one object being pushed by the surface of another object, the reaction force to this push produces an equal and opposite force for every unit of each object's mass. More transient acceleration, accompanied with significant jerk, is called shock. For example, an object at rest on Earth's surface is subject to 1 g, equaling the conventional value of gravitational acceleration on Earth, about 9.8 m/s 2. It is used for sustained accelerations, that cause a perception of weight. The g-force or gravitational force equivalent is mass-specific force (force per unit mass), expressed in units of standard gravity ( g, not to be confused with 'g', the symbol for grams). Combining this with the vertical g-force in the stationary case using the Pythagorean theorem yields a g-force of 5.4 g. This is a horizontal acceleration of 5.3 g. This top-fuel dragster can accelerate from zero to 160 kilometres per hour (99 mph) in 0.86 seconds.

The steeper the bank, the greater the g-forces. The pilot experiences 2 g and a doubled weight. In a steady level banked turn of 60°, lift equals double the weight ( L = 2 W).

In straight and level flight, lift ( L) equals weight ( W). JSTOR ( October 2022) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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