All Questions
9
questions
3
votes
2
answers
86
views
Tug of war between observers in frames with different rate of time
You have a very dense hollow sphere of matter. Observer A is inside the sphere inside a rocket. Observer B is in an identical rocket outside the sphere where the ring's gravity is negligible. They are ...
- 171
-2
votes
1
answer
139
views
If time moves slower the faster you go. Doesn't that mean that the gravity experienced will be lower too?
Disclaimer: I still don't understand the theory of general relativity. I'm completely ignorant.
I was watching the movie Interstellar yesterday and saw their interpretation of time dilation, I also ...
- 127
25
votes
4
answers
7k
views
If gravity is not a force, then how come gravitational assists work?
I have learned about general relativity and how gravity arises from spacetime curvature. And I have always been taught that gravity is not a real force in the sense that
$$\frac{dp}{dt} = 0$$
And from ...
- 1,896
20
votes
14
answers
6k
views
Why don't you feel gravity the same way you feel a car's acceleration? [closed]
If you are in an accelerating car or spaceship you feel an apparent force pushing you backwards, which as I understand is due to your own body's inertia (it wants to keep its current velocity but the ...
- 317
0
votes
1
answer
108
views
Are there different types of gravitational forces based on different types of masses ( inertial or relative etc)
There are different types of masses like inertial mass, passive gravitational mass, active gravitational mass, relative mass, et cetera. does Are there different types of gravitational forces that is ...
- 33
-4
votes
1
answer
773
views
If gravity is a fictitious force, could there be a real force counterpart for it atleast locally? [closed]
I wanted to ask the same question in different ways.
1.Consider the below example whereby we have a man M in a box B in outer space. B is acted upon by a force, F. B moves in direction of F. As the ...
- 73
-2
votes
2
answers
150
views
Can artificial force curve spacetime?
By artificial force, I mean a physical force applied by us onto an object which sets it in an accelerated motion (& not a natural force like gravity). eg: hitting a ball. Excuse me if the ...
- 73
2
votes
2
answers
2k
views
Why do we feel resistance to gravity rather than the acceleration of gravity?
What's the reason it behaves differently from all other forces? What I mean is, if you're in orbit you're accelerating toward the earth at almost 9.8m/s^2, but you feel nothing. If you are riding a ...
- 360
5
votes
2
answers
5k
views
When objects fall along geodesic paths of curved space-time, why is there no force acting on them?
On cseligman.com, it is written that
So, we see things falling with an acceleration which we call the acceleration of gravity,and thinking that we live in a straight line , uniformly moving or ...
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