Definitions for gravity of earth
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Gravity of Earth
The gravity of Earth, denoted g, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in meters per second squared or equivalently in newtons per kilogram. It has an approximate value of 9.81 m/s², which means that, ignoring the effects of air resistance, the speed of an object falling freely near the Earth's surface will increase by about 9.81 metres per second every second. This quantity is sometimes referred to informally as little g. There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth, given by the equation F = ma. However, other factors such as the rotation of the Earth also contribute to the net acceleration. The precise strength of Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as standard gravity is, by definition, 9.80665 m/s². This quantity is denoted variously as gn, ge, g0, gee, or simply g. The symbol g should not be confused with g, the abbreviation for gram.
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"gravity of earth." Definitions.net. STANDS4 LLC, 2014. Web. 10 Mar. 2014. <http://www.definitions.net/definition/gravity of earth>.