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cartuz
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If we have two particles with mass m1 and m2 than there is the gravity force between its. Can anyone answer why this force exist?
And when the distance between is very small and almost zero then the force is infinitive. Is this mean infinitive energy? It is strange.vanesch said:To Ki Man: please, no half-backed "new theories".
To the OP: as Danger said, "why" questions always end up unanswered. That doesn't mean, however, that "why" questions do not have a restricted meaning in science, but often, it means: "given these originally unrelated ideas, is there a connection?"
For instance, you could get the answer: "it looks as if there is a force of gravity, but that's because spacetime is bend and makes it look that way".
This is not a genuine answer to "why", but tries to explain the phenomenon using a deeper-lying idea. That begs the question of the reason for the deeper-lying idea, and in the end you question the most fundamental understanding as we have it at the moment, at which point the answer is only: "because things seem to be that way".
Nevertheless, each time we understand a phenomenon because of a deeper-lying principle, this is a great "aha!" moment
This is not only the case in science. All rational knowledge or argumentation is ultimately based upon some postulated truths, which cannot be argumented further ; or, if they are, they are being replaced by a new set of axioms. Sometimes it is simply: "because i feel it in my bones"
cartuz said:And when the distance between is very small and almost zero then the force is infinitive. Is this mean infinitive energy? It is strange.
cartuz said:And when the distance between is very small and almost zero then the force is infinitive.
And on what distance the Newtonian gravity forces don't work? What energy is correspond to this distance? What the maximum of this energy? May be mc^2?jtbell said:Only if the particles are very very small and they can get very very close to each other, according to current theories of gravity. But when you get to this scale you need quantum mechanics, and there is no generally accepted quantum-mechanical theory of gravity yet. We don't know what happens with gravity at such a small scale. It probably behaves very differently from classical theories, and even from general relativity, at those scales.
Office_Shreder, may be mc2 the maximum of all possible energy what the mass can to produce. I don't sure that the energy of this mass must be more.Office_Shredder said:mc2 is such a random concept to throw out here, it's almost funny
No, E=mc^{2}=\frac{m_{0}c^{2}}{\sqrt{1-v^{2}/c^{2}}}\approx \ m_{0}c^{2}+\frac{Office_Shredder said:E=mc2 is the rest mass of an object. Just by sitting there, it has that much energy because it IS made of energy (basically).
cartuz said:And on what distance the Newtonian gravity forces don't work?
jtbell said:Someone who knows more about GR than I do should probably comment on this, but my understanding is that black holes are not small.
xAxis said:if we have theoreticaly predicted black holes, how then we don't know anything about gravity at small distances?
Latin_of_Lite said:Why does gravity exist?
Excellent question! Unfortuneatly no one knows.
As of late, I've come the the conclusion that maybe gravity exist not because it's a force all its own, but because it's the left-over residual effect of another force--the electro-mangetic one.
(SNIP)
Gravity is a fundamental force of nature that causes objects with mass to be attracted to one another. It is one of the four fundamental forces of nature, along with electromagnetism, strong nuclear force, and weak nuclear force. The existence of gravity can be explained by Albert Einstein's theory of general relativity, which states that gravity is the result of the curvature of spacetime caused by mass.
Gravity affects objects by pulling them towards each other. The strength of gravity between two objects depends on their masses and the distance between them. The larger the masses and the closer the distance, the stronger the gravitational force between them. This is why we feel the pull of Earth's gravity, as it has a large mass compared to our own.
The existence of gravity is caused by the presence of mass. Any object with mass will produce a gravitational field that pulls other objects towards it. This is known as the law of universal gravitation, which was first described by Sir Isaac Newton in the 17th century.
The Earth's gravity field is what keeps us grounded and prevents us from floating off into space. It also plays a crucial role in the Earth's orbit around the sun and the moon's orbit around the Earth. The strength of the Earth's gravity field also varies depending on your location on the planet, as it is stronger near the poles and weaker near the equator.
While general relativity is the most widely accepted theory of gravity, there are other theories that attempt to explain it, such as string theory and loop quantum gravity. These theories are still being researched and are not yet fully understood. However, they all aim to explain the existence of gravity in different ways and may provide a more complete understanding of this fundamental force in the future.