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Gravity is a physical force that will attract two objects of mass toward each other. On Earth, it is the force that pulls all objects towards the surface of the planet. It also creates the sensation of weight. In interstellar space, it is observed as the force which keeps objects in orbit around one another.
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Fast Facts
- Also known as: Gravitation
- Responsible for keeping objects on Earth's surface
- Responsible for the orbit of the planets
- Observed force is stronger on planets with more mass
- Acceleration due to gravity on Earth is 9.8 m/s2
- Heavier objects will not accelerate faster than lighter objects
- First scientifically established by Sir Isaac Newton in 1665NASA Worldbook: Gravitation
- Albert Einstein established a more complex gravitational model in 1915
- Einstein's model does not contradict the Newtonian modelNASA Worldbook: Gravitation
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Newton's Law
Sir Isaac Newton's observations about gravity culminated in a simple relationship known as Newton's Law:- The gravitational force between two objects is directly proportional to their masses
Represented mathematically:
- ForceGravity = (Mass1 * Mass2) / (Distance2)
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Related Mahalo Pages
Physics | Albert Einstein | Sir Isaac Newton | Inertia | Earth | Astronomy | Landslides | Plate Tectonics | Galileo
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The Mahalo Top 7
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Article: Sir Isaac Newton: The Universal Law of Gravitation
csep10.phys.utk.edu -
Wikipedia: Gravitation
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Stanford University: Gravity Probe B
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NASA: World Book Encyclopedia: Gravity
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M. Caso Associates: Learning Center: Gravity
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Article: Gravity Made Simple
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Nova: Einsteins Big Idea
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Article: Sir Isaac Newton: The Universal Law of Gravitation
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Gravity on Twitter Powered by Twitter
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@chriscolfer OMG YOUR VERSION OF "DEFYING GRAVITY" IS PERFECT. THERE ARE ANGELS SINGING ANYTIME IT PLAYS OMG ♥
@taystwin_14 | November 09, 2009 04:13 AM -
If NASA were to send birds into space, they would soon die because birds need gravity to swallow.
@Gemelle2T2 | November 09, 2009 04:11 AM -
lol, the rahcel defying gravity cuts out before the first chorus lol.
@arnii | November 09, 2009 04:11 AM -
Who else is jamming to "Defying Gravity" from Glee??? God damn Chris with those pipes! I love that guy something fierce!
@happydorkjc | November 09, 2009 04:10 AM -
..12 billion dollars to develop a pen that would write in zero gravity, upside down, under water, on any surface and in extreme tempatures..
@hyperory | November 09, 2009 04:10 AM
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Gravity on Amazon | View All
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Gravity's Rainbow (Penguin Classics Deluxe Edition) - $20.00
Winner of the 1973 National Book Award, Gravity’s Rainbow is a postmodern epic, a work as exhaustively significant to the second half of the twentieth century as Joyce’s Ulysses was to the first. Its sprawling, encyclopedi...
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Defying Gravity - $18.98
Keith Urban is an artist in all aspects of the word. He carefully crafts the songs he records, tweaking lyrics and melodies until they are just right. Keith might argue that a song is never perfect, but judging from the rapid success of his...
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Gravity - $19.99
Professor Heinz Wolff's Gravity is a game of 100 set-'em-up and knock-'em-down puzzles, all based on the laws of physics. Players construct devices from building blocks, levers, conduits, and other parts. True to the title, most puzzles are...
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Questions and Answers About Gravity | View All | Ask a Question
View All Gravity Questions (50) | Ask a QuestionCan life survive in low gravity or zero gravity indefinitely? (3 Answers)Gravity determines the scale of many physical phenomena on and above a world's surface. Assuming that toolusing intelligences come from, and would settle, worlds with solid surfaces and gravities equal ... read moreWhy does gravity take affect instantly? (2 Answers)Gravity is not faster than light. According to general relativity, the speed of gravity is equal to the speed of light. General relativity agrees with observations of a binary pulsar ... read moreHow is Anti-hydrogen affected by gravity? (1 Answer)Anti-hydrogen has the same mass as hydrogen. It will be affected by gravity the same way hydrogen is. read moreWhat is the quantum theory for how gravity works? (1 Answer)This is one of the largest questions ever asked. Nobody has found a definitive answer yet, although there are many ideas. Hopefully my link provides a little bit of insight. ... read more
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