why matter atracts matter towards their centre of mass, that is gravity ?

Question

plz give ur answer seriously

Answer 1

In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force, or time-space itself is envisioned as discrete in nature, or both

but recently it is thought that our universe is not only the one existing. acording to the Membrane theory there are many parallel universe. to explain the movment of these universe we need 11 dimensions. Now gravity is thought to be a force seeping in our universe from another parallel universe thats why it is so weak. this gravity is very strong in that universe

Answer 2

It is not true that the gravitational attraction between two distributed bodies is in the direction of the center of mass. If one of the bodies is elongated, for example, the direction of the force vector will be pointed more towards the part that is closest. Two spherical masses will be attacted towards each other's centers, though. From symmetry, after all, where else would the force vector point? Newton proved that the force in that case is the same as if you assumed the mass was concentrated at the sphere's center. Maybe that factoid is what prompted your misconception. It's proved using calculus (which Newton coinvented). A modern proof uses Gauss's law.

Answer 3

Notice that the planets of our solar system are spherical in design, as is, also, our sun. The reason they are formed into this particular shape is due to the heat energy within them. This concept may be seen in the common ice cube. The water, if it were in a space station, would remain in a cube shape until it melted. Once melted, and if it were left alone, it would form into the shape of a sphere - the same as our sun and its planets. This same thing would happen to the odd shaped asteroids that are within our solar system. Were a great deal of heat energy applied to them, then they also would form into the shape of a sphere. Now, what is the reason for a heated mass forming into this particular shape?

The equation for a gravitational field is c2 = E/m. The energy is this instance is that of heat contained within the mass. As this kind of energy increases so, also, does the gravitational field. As this value decreases within a mass so, also does the force of gravity. Were there to be a mass the size of our planet, and were it to have no heat energy within [c2 = (energy) / mass], then that mass would have no gravity. Because the force of gravity performs work, there must be an energy source initating a change.

The energy released by c2 = E/m is that of gravitons. Below the Mohorivic discontinuity (about 22 miles below us) all gravitons move toward the very center of our planet, then they pass through all the mass on the other side, and outward into outerspace. Because this energy forms all about the core point of our planet, the mass is formed into the shape of a sphere, as it is pulled toward that location. Not only is the mass pulled toward the center of a large solar mass, but the heat energy also is drawn to that location. Were this not true, then our planet would be almost the same temperature throughout.

There is a short writing "What is Gravity" found at http://360.yahoo.com/noddarc along with others, that may be of interest to you.

Answer 4

Regarding the center of gravity:

All of the bits of matter (at least down to the subatomic level) are exerting gravitational pull independently of all others. "The center of gravity" is a concept that takes advantage of the fact that, outside a chunk of massive matter, the gravitational pull acts as if it is emanating from a point source, with the force vector pointing at that point and not to other outlying bits of matter. The reason is that the components of the force that are perpendicular to the line to the center of gravity are being canceled out by bits of matter on opposing sides of the center of gravity. As other answerers have noted, the center of gravity for oddly-shaped chunks of matter may be near one end or the other, and may change depending on the orientation to the "thing" being attracted.

Regarding gravity in general:

In a way, gravity is the most perplexing of the 4 forces at this time. The Higgs boson that physicists are desperately searching for in particle accelerators may provide a "particle" solution to the force of gravity and bring gravity into the unified theory, the Holy Grail of physics. Problem is, Higgs is thought to be really heavy, so a real big hammer is needed to make it pop out of the experimental fodder. When funding failed for the SSC in Texas, CERN became the final hunting ground for Higgs.

Answer 5

The nature of gravity is just that--an attractive force which is directed towards the center of any mass. Think about why this is:

If a collection of things were somehow attracted to one another evenly or otherwise, how would their attraction be shown in animation? All particles would be traveling toward some center created by the nature of gravitation itself. If all particles attract all other particles around them and all other particles equally attract those other particles, what's observed is motion towards the center of all particles. (ex: formation of round objects in our universe--planets, stars, etc)

The same is true of one particle (say the Earth) had a larger value for its force of gravitation than surrounding particles (say human beings).

Answer 6

ya basiclly any multiple particle on the basis of mutual gravitational pull will tend to move towaards some commun central point and this will always be centre of mass

Answer 7

hi asker,
you know that gravity is a CONSERVATIVE force,that means
it acts between centres of bodies.this is because centre is the point
of symmetry of bodies

Answer 8

that's a rule of nature...don't think about it!

"Gravity" is the atraction fo earth and other matter.

Answer 9

centripetal force.
If you look into another angle, u can think of nucleas and electron model