However, the Earth deviates slightly from this ideal, and there are consequently slight deviations in both the magnitude and direction of gravity across its surface. Variations in gravity and apparent gravity محسن Ī perfect sphere of spherically uniform density (density varies solely with distance from center) would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly towards the sphere's center. 3 Comparative gravities of the Earth, Sun, Moon, and planets. 2 Estimating g from the law of universal gravitation.1.5 Comparative gravities in various cities around the world.the value of gravitional constant is not correct value i have a proof 1 Variations in gravity and apparent gravity محسن.The symbol g should not be confused with g, the abbreviation for gram (which is not italicized). This quantity is denoted variously as g n, g e (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s 2), g 0, gee, or simply g (which is also used for the variable local value). However, other factors such as the rotation of the Earth also contribute to the net acceleration.Īlthough 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/s 2 (32.1737 ft/s 2). There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth, given by the equation F = ma ( force = mass × acceleration). This quantity is sometimes referred to informally as little g (in contrast, the gravitational constant G is referred to as big G). It has an approximate value of 9.81 m/s 2, 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 meters (about 32.2 ft) per second every second.
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