All Questions
11 questions
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103
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Direction of spacetime curvature?
I am honestly new to all. But, I am confused about space time curvature and gravity.
I see in lots of graphs that the spacetime bends when there is a mass in it, and that bend is in the direction of ...
1
vote
1
answer
344
views
Electric force in general relativity
In general relativity, for two electrons in a space-time how do we define the electric force? Is it such that we have in classical physics or they go away from each other because of the curvature that ...
- 39
2
votes
1
answer
129
views
Lorentz Four-force in General relativity?
In special relativity, it's normal to define Lorentz four-force density as $$f_\mu = F_{\mu\nu}\nabla _\lambda F^{\nu \lambda},$$
having Maxwell EM tensor $F_{\mu\nu}$. Can we do it in General ...
- 290
1
vote
2
answers
124
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How do we apply force on a body?
We know that force is apllied either by pushing or pulling anything.
But how do we push or pull or apply force on anything.
I imagine the object A that is pushing and another object B that is getting ...
user316791
0
votes
1
answer
77
views
Do all forces of nature produce opposite force when they move?
I am not sure if I understand it right but as I see it any two moving charge particles must repel each other like they are not moving relative to observer that moving at the same speed as they moving,
...
- 247
5
votes
1
answer
770
views
What is the mechanism that causes forces to get unified at high energies?
There are a lot of questions and answers on this site about the unification of forces, and all of them univocally say that at high energy levels, all the forces get unified. But none of them answer my ...
- 29.8k
1
vote
6
answers
312
views
If gravity were a "real" force, then how would I be able to tell if I'm falling or accelerating in space or on Earth?
Background:
I think it would be helpful for laypersons like myself to understand how, in practice, a "real" force differs from a pseudo-force. Virtually all explanations (eg, on this stack, ...
- 121
4
votes
1
answer
708
views
Why is there not a General Relativity for forces other than gravity?
I think what I'm looking for here is some sort of a bridge between the very material terms and mental images that I have access to and more of a pure math understanding. My deepest exposure to ...
- 143
-1
votes
2
answers
275
views
Why is gravity so special?
I am not a physicist but still I love the subject very much. A thought recently popped up in my mind while studying and I'm still confused about it.
"If a person falls freely he will not feel ...
- 758
0
votes
1
answer
103
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Force Particles?
Since Einstein has shown that gravitational force is created by the warping of Space-Time, why are physicists looking for the "graviton" particle?
Since gravitational force is created by a warping of ...
11
votes
2
answers
380
views
Charged Accelerometer in Orbit
It is well known that an accelerometer (or any other object for that matter) in a gravitational orbit will register nearly zero acceleration. According to this answer, this is because the object is, ...
- 209