The second major cause for the difference in gravity at different latitudes is that the Earth's equatorial bulge (itself also caused by inertia) causes objects at the Equator to be farther from the planet's center than objects at the poles. This counteracts the Earth's gravity to a small degree – up to a maximum of 0.3% at the Equator – reducing the downward acceleration of falling objects. The differences of Earth's gravity around the Antarctic continent.Īt latitudes nearer the Equator, the inertia produced by Earth's rotation is stronger than at polar latitudes. Parameters affecting the apparent or actual strength of Earth's gravity i A scale or plumb bob measures only this effective gravity. Furthermore, the net force exerted on an object due to the Earth, called "effective gravity" or "apparent gravity", varies due to the presence of other forces, such as inertia caused by the Earth's rotation. 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. s -2) or equivalently in newtons per kilogram (N/kg or N.In SI units this acceleration is measured in meters per second per second (in symbols, m/ s 2hi or m The gravity of Earth, denoted g, refers to the acceleration that the Earth imparts to objects on or near its surface. As with the Units of Measurement Wiki, the text of Wikipedia is available under Creative Commons License see Wikia:Licensing. The list of authors can be seen in the page history. The original article was at Gravity of Earth. This page uses content from the English Wikipedia.
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