Gravity verses electromagnetic attraction

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W3pcq: I concern physics. The OP asked a physics related question and he should get the answer from contemporary physics, not just speculations from laymen non-physicists (see the forum rules), they you may keep to yourself or post elsewhere.


nuby: All mass generates gravity, just not the neutron.
I may be mistaken, but I have always thought that a neutron generates gravity.
 
  • #27
malawi_glenn
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I may be mistaken, but I have always thought that a neutron generates gravity.
All mass generates gravuty, just not the neutron.
 
  • #28
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So the neutron doesn't generate gravity?
 
  • #29
malawi_glenn
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Lol thank you redbelly. That claim was thrown out there but nobody wants to take up the task of explaining it? :P

One can just google "Gravity + repulsive" and see if one gets realible source which can explian it. I did not find much, nor in my cosmology books.
 
  • #30
malawi_glenn
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So the neutron doesn't generate gravity?

Well what is the mass of the neutron?
 
  • #31
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Isn't the mass of the neutron=to the mass of a proton?
 
  • #32
malawi_glenn
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Isn't the mass of the neutron=to the mass of a proton?
Well roughly, it is a little little bit heavier. So does neutrons generate gravity?
 
  • #33
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I guess the answer you are looking for is no because gravity is a result of a change of the structure of space time and not generated by mass.
 
  • #34
malawi_glenn
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I tohugh you could use your logic, since I have two times stated that all mass generates gravity and since the neutrons have mass, they generate gravity. Many people thinks that the role of the neutron in atoms are to generate gravity, that is a very big missconception!!! (does not the hydrogen atom generate gravity??).

Another missconception is that people tends to separate gravity from space-time curvaturing. Gravity IS curvature in space, generated by mass.
 
  • #35
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I tohugh you could use your logic, since I have two times stated that all mass generates gravity and since the neutrons have mass, they generate gravity. Many people thinks that the role of the neutron in atoms are to generate gravity, that is a very big missconception!!! (does not the hydrogen atom generate gravity??).

Another missconception is that people tends to separate gravity from space-time curvaturing. Gravity IS curvature in space, generated by mass.
According to general relativity it is. Of coarse that is a grossly over simplified way of putting it.
 
  • #36
malawi_glenn
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What is over simplified? The General Theory of gravity? Have you studied it at university?
 
  • #37
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What is over simplified? The General Theory of gravity? Have you studied it at university?
That gravity is caused by the curved space time. Do you actually understand what that means or how that works?

Also, I have never heard of "The general theory of gravity", what is that?
 
  • #38
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I tohugh you could use your logic, since I have two times stated that all mass generates gravity and since the neutrons have mass, they generate gravity. Many people thinks that the role of the neutron in atoms are to generate gravity, that is a very big missconception!!! (does not the hydrogen atom generate gravity??).

Another missconception is that people tends to separate gravity from space-time curvaturing. Gravity IS curvature in space, generated by mass.
Sorry, you should have said it different, you must not know the english language very well. You should have said it like this: All mass generates gravity, NOT just the neutron.
 
  • #39
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It is just boring to thoughtlessly recite lines that you have memorized and not even understand what you are saying.
 
  • #40
cristo
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That gravity is caused by the curved space time. Do you actually understand what that means or how that works?
I'm not sure that this is the place for teaching you General Relativity. In short, and as malawi_glenn has mentioned, gravity is the curvature of spacetime-- it is not cause by the curvature of spacetime.

Nerfmonkey said:
In some cases gravity can be repulsive instead of attractive. But in every day circumstances you're right.
Elaborate. I am mystified.
I guess Nerfmonkey is talking about exotic scenarios in which the pressure of the "matter" is negative, like in the case of "dark energy" (whatever that may be). This will give rise to a repulsive gravity term.
 
  • #41
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One theory about the accelerating universe is that gravity becomes repulsive in some conditions.
 
  • #42
cristo
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One theory about the accelerating universe is that gravity becomes repulsive in some conditions.
:confused: You mean like the condition I just mentioned?
 
  • #43
malawi_glenn
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i. Yes a know a bit how Einsteins field equations work, but I will not be able to study its derivations and so on until I get into grad-school, I am still undergraduate and we have still only got the forumulas and learn how to use them, not to derive them.

ii. The general theory of gravity is called many things, like Einsteins general theory of relativity and so forth.

If you don't have any idea what this is, then I am stunned how you still want to argue with me about what gravity is and how it works. The language of physics is math, therefore one can not understand physics correct by using every day life thinking and non-mathematical reasoning.

iii. I ve seen many people who have the missconception that the neutron is the only source of gravity in atoms.

iv. I have quite good knowledge about the English language, if I say "All mass generates gravity" then I of course mean that neutrons, which has mass, is generating gravity. Then one can use his/hers logic to draw the conclusion that massive objects which are not neutrons also generates gravity.

v. I think its boring that people who aren't students of physics, or working physicists, can judge wheater a person have understand something or not. As cristo said, this is not the appropiate place where to study general theory of gravity (I can give you a study plan and book references if you want to learn it, or recommend a college/university), but we (who are physicists) can answer questions about gravity in a short and quite understandable way (that is of course something subjective).

The main question was "what is the difference between gravity and electro magnetic force"? Then some missconceptions where brougth up (the ones I mentioned earlier), and those I gave short comments on.
 
  • #44
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I would like to know more about the link between time and gravity. When an object approaches a gravitational field, it's clock slows right. Why is this? Does this have anything to do with sub atomic spin?
 
  • #45
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:confused: You mean like the condition I just mentioned?
You added that part in after I posted.
 
  • #46
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i. Yes a know a bit how Einsteins field equations work, but I will not be able to study its derivations and so on until I get into grad-school, I am still undergraduate and we have still only got the forumulas and learn how to use them, not to derive them.

ii. The general theory of gravity is called many things, like Einsteins general theory of relativity and so forth.

If you don't have any idea what this is, then I am stunned how you still want to argue with me about what gravity is and how it works. The language of physics is math, therefore one can not understand physics correct by using every day life thinking and non-mathematical reasoning.

iii. I ve seen many people who have the missconception that the neutron is the only source of gravity in atoms.

iv. I have quite good knowledge about the English language, if I say "All mass generates gravity" then I of course mean that neutrons, which has mass, is generating gravity. Then one can use his/hers logic to draw the conclusion that massive objects which are not neutrons also generates gravity.

v. I think its boring that people who aren't students of physics, or working physicists, can judge wheater a person have understand something or not. As cristo said, this is not the appropiate place where to study general theory of gravity (I can give you a study plan and book references if you want to learn it, or recommend a college/university), but we (who are physicists) can answer questions about gravity in a short and quite understandable way (that is of course something subjective).

The main question was "what is the difference between gravity and electro magnetic force"? Then some missconceptions where brougth up (the ones I mentioned earlier), and those I gave short comments on.
I didn't ever mean to get into an argument with you. You kept wording a sentence wrong making it mean something that you didn't intend.
 
  • #47
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Look, I'm sorry I used a metaphor that isn't in a physics book to try and look at things from a new angle. Why are you guys so upset about it?
 
  • #48
malawi_glenn
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I would like to know more about the link between time and gravity. When an object approaches a gravitational field, it's clock slows right. Why is this? Does this have anything to do with sub atomic spin?
Remember that the general theory of gravity is not a quantum theory.

You may want to start a new thread or search for old or just google, there is plenty much written about this topic.
 
  • #49
malawi_glenn
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I didn't ever mean to get into an argument with you. You kept wording a sentence wrong making it mean something that you didn't intend.
So what is wrong with "All mass generates gravity" ?
 
  • #50
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Remember that the general theory of gravity is not a quantum theory.

You may want to start a new thread or search for old or just google, there is plenty much written about this topic.
This is an Astrophysics forum not a GR forum. If we can only talk about GR, then maybe it should be moved there?
 

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