Gravity

:For other senses of the words gravity and gravitation, see gravity (disambiguation).

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Gravity is the force of attraction between massive particles. Weight is determined by the mass of an object and its location in a gravitational field. While a great deal is known about the properties of gravity, the ultimate cause of the gravitational force remains an open question. General relativity is the most successful theory of gravitation to date. It postulates that mass and energy curve space-time, resulting in the phenomenon known as gravity.

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The first mathematical formulation of gravity was published in 1687 by Sir Isaac Newton. His law of universal gravitation was the standard theory of gravity until work by Albert Einstein and others on general relativity. Since calculations in general relativity are complicated, and Newtonian gravity is sufficiently accurate for calculations involving weak gravitational fields (e.g., launching rockets, projectiles, pendulums, etc.), Newton's formulae are generally preferred.

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Steven Weinberg noted that we would still build a suspension bridge to modern gravity theory with Newton's laws. Newton's theory is much simpler than general relativity, and used very often, so it is usually taught first.

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Force: In physics, a force is an external cause responsible for any change of a physical system. For instance, a person holding a dog by a rope is experiencing the force applied by the rope on his hand, and the cause for its pulling forward is the force exercised by the rope. The kinetic expression of th...

Attraction: In general, attraction is a force that moves one object to another....

Particle: A particle is...

Gravity related Images and Photos (experimental)

Gravity	Gravity	Switchfoot: Oh! Gravity.	Switchfoot: Oh! Gravity.
Obey gravity. It's the law!	Obey Gravity - Kids	Gravity #5 Cover: Gravity and Black Death	Obey Gravity Babydoll
Obey Gravity Babydoll	Obey Gravity Babydoll	Obey Gravity Bumper Sticker	Oh Gravity... Thou Art a Heartless Bitch