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2006-06-20 05:37:37 · 15 answers · asked by Anonymous in Science & Mathematics Physics

15 answers

Gravity is caused by the mass of the Earth and has nothing to do with it's spinning. The spinning of the Earth actually reduces the "gravity" felt by someone at the equator as compared to someone at one of the poles. It is just one of the facts of the Universe that everything that weighs anything, pulls other matter towards it, and the more it weighs, the bigger the pull.
According to Einstein's Theory of General Relativity, gravity is the curvature of space that results from a massive object. Think of a sheet of rubber with heavy marbles placed on it. The rubber around the marbles will be curved and smaller marbles placed nearby will roll toward the heavier ones. This is analogous to the way massive objects warp space. This warping is called gravity.

2006-07-03 20:26:51 · answer #1 · answered by Anonymous · 1 1

The cause of gravitational force lies at the most fundamental level of physics, its like asking where did electron get its charge from that other particels do not. Gravitational force is applied to a mass in the presence of a gravitational field. Gravitational field, is the attractive field that surrounds a mass in space. Thats all the basics, now to answer your question, I need to go a little deeper than that.

To detect gravitational field around a mass, you need to place another mass in the field and measure the size of force applied to it. This is the only way of detecting this field. the reason for this is that, the source producing the field is exchanging particles with the mass you place in the field. These particles are knows gravitons, which means, ultimately, Gravity is quantised. The quantisation of gravity is very complex, which i won't go into right now. you can have a look at it if u just search "quantisation of gravity" in yahoo or google.

What this means, is that the field is only present if another mass has been placed near a primary mass source. Therefore, gravity cannot be present unless you have more than 1 mass. Gravity is the interaction between 2 masses, they interact by exchanging gravitons, and this is basically where it came from.

If you want to know how gravitons give rise to gravity then you need to read the equations of eikipedia about it.

2006-06-20 05:58:26 · answer #2 · answered by doctorwho888 2 · 0 0

Everything that has mass has a gravitational force associated to it. The more mass an object has the greater the force. The gravitational force between two objects can be calculated by:
F = G * [m(1) * m(2)] / r^2
where
F = gravitational force in Newtons
G = gravitational constant = 6.6742 * 10^(-11) N * m^2 / kg^2
m(1) & m(2) are the masses of the objects in kilograms
r = distance between m(1) and m(2) in meters

2006-06-20 05:43:13 · answer #3 · answered by Nate 3 · 0 0

No one is sure what causes it other than any thing with matter has it. The equation fo the force of gravity is dependant only on matter and distance. Scientists have theorized a partical called a gravition transferes the information of gravity back and forth between objects but no one knows. If I threw a ball at your head. The energy from my hand gave energy to the ball which took some of that energy and force into your head. No one knows how this works with Gravity.

Einstien's theory was his General Theory of Relativity which said that the presence of matter causesd space to curve. The curving motion of an object around another (like the Earth around the Sun) was because the massive object curved space causing the moving object to move in a circular path toward the massive object.

2006-06-29 05:47:33 · answer #4 · answered by bulldog5667 3 · 0 0

the law of gravity according to newton is...
the gravitational force between 2 bodies of masses m1 and m2; and are seperated by a distance of d is
1. Directly proportional to the product of the masses m1*m2
2. Iinversely proportional to the square of the distance between them 1/d(square)

thus gravitational force is

F = G. m1*m2/(d^2)

where G is the constant og Gravity.. i forgot the exact value of G, but it's really small.
That's the reason why only very big objects have a strong gravitational field(like planets, stars, etc)

Small objects have negligble gravity.

The gravitational force decreases with increase in distance.. that's why when u are away from earth.. u can fly in Space!

Gravitational Force is caused due to the field Particle known as GRAVITON

2006-06-20 14:28:06 · answer #5 · answered by *~dazzling.black~* 4 · 0 0

Careful. If the moon orbits the planet in a day, and if by a day you mean a day according to that planet's rotation, then the moon always stays over the same point on the planet. There will be no relative motion of the tides, just a relatively stationary tidal bulge. You will not be able to extract energy in this scenario at all. To fix your scenario in the simplest way possible, let's assume the planet does not rotate at all, and what you mean by "day" is 24 Earth hours. Then refer to Big Daddy's answer. Now in the case of the Earth and it's moon, the Earth rotates faster than the Moon completes an orbit. So the tidal bulge is actually ahead of the moon, and it actually accelerates the moon and puts it in a higher orbit. This adds energy to the moon, but it removes it from the Earth, causing the Earth to rotate more slowly and have longer days. This is a real deal and they actually have to adjust the clocks to account for it! (By like microseconds every year; it only matters to people doing e.g. precise astronomical calculations.) Overall energy is not just transferred from the Earth to the Moon, some is lost as waste energy, e.g. heat, the sound of waves crashing; or useful energy, if you have a tidal power plant.

2016-05-20 05:03:40 · answer #6 · answered by Anonymous · 0 0

The source of gravitational force is mass. Gravitational force is caused when two masses interact with each other.

2006-06-20 08:12:03 · answer #7 · answered by Alfonzo J 1 · 0 0

Gravity is caused by the curvature of space time around a body with mass. It's demonstrated by putting a heavy sphere (like a bowling ball) on a thick rubber sheet and rolling steal balls around it. (this demonstrates how planets are kept in orbit by gravity). To explain why you, me and everyone else does not go floating off into space is a tad more difficult. Physicists are looking for Gravitons (theoretical particles that mediate the gravitational force) but in my opinion they are just waisting their time. God doesn't need redundancies in dealing with the four fundamental forces of nature. What causes space-time to curve is like asking why doesn't the electron in the 1st electron shell of an atom fall into the nucleus (it should) but it just doesn't.

2006-06-20 05:52:04 · answer #8 · answered by Master Quark 3 · 0 0

According to the general theory of relativity, gravitation is not a force, but an effect of that everything wants to take "the shortest way" through the space-time. Massive masses bends the universe, the space-time, making a way that seems to be bend, actually becoming the shortest way through space time.

2006-06-20 05:47:21 · answer #9 · answered by User1 2 · 0 0

gravity is the tendency of objects with mass to accelerate toward each other.

well there have been different theories of gravity's source:

Aristotle "believed that there was no effect without a cause, and therefore no motion without a force. He concluded that all things tried to move toward their proper place in the crystalline spheres of the heavens, and that bodies fell toward the center of the Earth in proportion to their weight."

"the Indian astronomer Brahmagupta explained that "bodies fall towards the earth as it is in the nature of the earth to attract bodies, just as it is in the nature of water to flow"."

2006-06-20 05:45:57 · answer #10 · answered by mmmmy_sharona 1 · 0 0

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