Why two mass attracts each other?

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hansda said:
I have a understanding that, "Gravitational Force" is dependent on "Strong Nuclear Force".
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eram said:
Where the hell did you get that from?
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This is from Einstein's Paper and Einstein's Equation E=mc^2. Einstein in his paper proved that "inertia of a mass is dependent on its energy content". So, we can write m=E/c^2.

Gravitational Force F=G*m1*m2/r^2 can be re-written as F=G(E1/c^2)(E2/c^2)/r^2 or F=(G/c^4)(E1*E2)/r^2.


"Strong Nuclear Force" keep proton and neutron together. This nucleus keep the whole atom together. So, "strong nuclear force" keep the "energy content(E)" of a mass(m) together. So, inertia of a mass(m) is dependent on "Strong Nuclear Force".

As "Gravitational Force" is dependent on mass(m), so it is also dependent on "Strong Nuclear Force".
 
hansda said:
This is from Einstein's Paper and Einstein's Equation E=mc^2. Einstein in his paper proved that "inertia of a mass is dependent on its energy content". So, we can write m=E/c^2.

Gravitational Force F=G*m1*m2/r^2 can be re-written as F=G(E1/c^2)(E2/c^2)/r^2 or F=(G/c^4)(E1*E2)/r^2.


"Strong Nuclear Force" keep proton and neutron together. This nucleus keep the whole atom together. So, "strong nuclear force" keep the "energy content(E)" of a mass(m) together. So, inertia of a mass(m) is dependent on "Strong Nuclear Force".

As "Gravitational Force" is dependent on mass(m), so it is also dependent on "Strong Nuclear Force".
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Once again you're just loosely associating certain terms. It's too vague for anyone to assess.
 
eram said:
Once again you're just loosely associating certain terms. It's too vague for anyone to assess.
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Where is your problem? All the terms F, G, E, c and m mean their usual meaning or you want their explanations also.
 
eram said:
So what if I read those? You're still too vague.
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Read this quote from wiki

wiki said:
The strong interaction is observable in two areas: on a larger scale (about 1 to 3 femtometers (fm)), it is the force that binds protons and neutrons (nucleons) together to form the nucleus of an atom - in this form, it is often referred to as the nuclear force. On the smaller scale (less than about 0.8 fm, the radius of a nucleon), it is the force (carried by gluons) that holds quarks together to form protons, neutrons and other hadron particles.
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So, mass of an atom is due to this "Strong Nuclear Force".
 
Farsight said:
I understand the difference between chirality and helicity and was never confused by it. Chirality is a feature of electromagnetism. Google it and what comes up? Top of the list is the wikipedia article Chirality (electromagnetism). Electromagnetic wave propagation is described in terms of helicity, but we can conduct pair production with electromagnetic waves to create the electron and the positron which exhibit opposite chirality. They do not acquire it by some kind of magic. Chirality is a feature of QED too. I suggest you accept it and simply move on.
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Indeed. I would invite people to follow that Wikipedia link, and read for themselves.
Point made.
 
hansda said:
This is from Einstein's Paper and Einstein's Equation E=mc^2. Einstein in his paper proved that "inertia of a mass is dependent on its energy content". So, we can write m=E/c^2.
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There's no problem with that.

hansda said:
Gravitational Force F=G*m1*m2/r^2 can be re-written as F=G(E1/c^2)(E2/c^2)/r^2 or F=(G/c^4)(E1*E2)/r^2.
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Or that.

hansda said:
"Strong Nuclear Force" keep proton and neutron together. This nucleus keep the whole atom together. So, "strong nuclear force" keep the "energy content(E)" of a mass(m) together. So, inertia of a mass(m) is dependent on "Strong Nuclear Force".
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This isn't quite right I'm afraid. The strong nuclear force keeps a proton together, the residual strong force keeps an atom together. And a body will lose mass if if emits a photon. That body can be a photon in a box.

hansda said:
"As "Gravitational Force" is dependent on mass(m), so it is also dependent on "Strong Nuclear Force".
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I'm sorry hansda, it's dependent on energy. In Einstein's Foundation of the General Theory of Relativity he says "the energy of a gravitational field shall act gravitatively in the same way as any other kind of energy". The gravitational field itself causes gravity because there's energy in it, not because there's matter in it along with the strong nuclear force.
 
Farsight said:
This isn't quite right I'm afraid. The strong nuclear force keeps a proton together, the residual strong force keeps an atom together. And a body will lose mass if if emits a photon. That body can be a photon in a box.
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Read my post #107 for wiki quote on "strong nuclear force".

I'm sorry hansda, it's dependent on energy. In Einstein's Foundation of the General Theory of Relativity he says "the energy of a gravitational field shall act gravitatively in the same way as any other kind of energy". The gravitational field itself causes gravity because there's energy in it, not because there's matter in it along with the strong nuclear force.
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I am not considering GR here but Newton's equation for gravity.
 
hansda said:
It was your question in post #93 about how "gravitational force" is related with "strong nuclear force".

As "gravity" depends on "mass" and "mass" depends on "strong nuclear force"; so, "gravity" depends on "strong nuclear force".
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Ok, you've answered my question, I just want to reiterate that your statement is too vague. Do you have any other queries?
 
the residual strong force keeps an atom together
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Wrong. It keeps the nucleus together, not the atom.
Now, it should be interesting to see whether this correction will result in a flurry of links and quotes trying to show how little I understand of physics :)
 
You're right Markus. I typed "atom" because it was in my mind after Hansda said "Strong Nuclear Force" keep proton and neutron together. This nucleus keep the whole atom together. Apologies for the error.
 
hansda said:
As per GR, space-time curves around a mass to generate force.

Is it possible that, curvature of space-time around two mass will form a loop and because of this looping of space-time; two mass will attract but not repel.
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This is something I've always struggled with.
If all the large dimensions are accounted for....and gravity is literally all of spacetime(all 4 large dimensions) bending....don't you need another dimension for it to bend into? If spacetime(all 4 dimensions) is a line, and that line bends....by definition that line must exist on a 2 dimensional plane.

Am I correct to say, it's not the stuff IN spacetime that is bending...it's spacetime itself?
 
Not strictly. Strictly speaking, spacetime is an abstract mathematical space in which motion does not occur because it models space at all times. You can draw world-lines in it, and you can draw them curved, but that worldline represents the motion of a body through space over time. The body doesn't actually move through spacetime. People tend to talk of "the spacetime around the Earth" and suggest that light moves through it, but actually, that's wrong. Pay careful attention to Einstein's 1920 Leyden address where he said this:

“According to this theory the metrical qualities of the continuum of space-time differ in the environment of different points of space-time, and are partly conditioned by the matter existing outside of the territory under consideration. This space-time variability of the reciprocal relations of the standards of space and time, or, perhaps, the recognition of the fact that “empty space” in its physical relation is neither homogeneous nor isotropic, compelling us to describe its state by ten functions (the gravitation potentials gμν), has, I think, finally disposed of the view that space is physically empty.”.

Metric is to do with measurement. The metrical qualities of the continuum of space-time differ because space is neither homogeneous nor isotropic. You can get a handle on this by placing gedanken light-clocks in an equatorial plane through the Earth. The light-clocks run at different rates, and when you plot your measurements your plot is curved just like the wikipedia plot of gravitational potential which is like the bowling-ball-in-the-rubber-sheet pictures. But the light-clocks didn't run at different rates because your plot was curved, they ran at different rates because the space they're in is inhomogeneous. Google on inhomogeneous vacuum for more information.
 
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