A person standing at the top of a mountain experiences a g-force slightly below 1 g due to greater distance from the centre of the Earth. Conversely, falling gives an experienced weight of 0 g. For example, being accelerated upward on Earth with an acceleration of 1 g doubles the experienced weight to a g-force of 2 g. It is found by vector addition of the opposite of the actual acceleration (in the sense of rate of change of velocity) and a vector of the local gravity (about 1 g downward for the Earth's surface). The acceleration a body internally "experiences" is the apparent weight per unit mass. 5.2 Strongest g-forces survived by humans.The symbol g is properly written in lowercase and italic, to distinguish it from the symbol G, the gravitational constant, which is always written in uppercase and from g, the symbol for gram, which is not italicized. Unlike simple acceleration, g-force is a measure of the magnitude of the acceleration relative to the local gravitational acceleration vector, rather than being compared to an inertial reference frame. Thus g-force is considered by some to be a misnomer and is not an accepted technical term. Because of the confusion between this term being a force or an acceleration, it is often better to refer to it as acceleration rather than g-force. Sometimes g-force also refers to the force associated with an acceleration (in that case, the unit is pounds-force or Newtons). G-force (also gee-force, gee-loading) is a non- SI vector measure of acceleration, where 1 g ( pronounced ) is defined to be an acceleration of the same magnitude as the nominal acceleration due to gravity on Earth at sea level – an acceleration equal to 9.80665 m/s 2, or approximately 32.174 ft/s 2. For other uses, see G force (disambiguation). ![]() This article is about a measure of acceleration.
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