Linked Questions

141
votes
5answers
47k views

Why would spacetime curvature cause gravity?

It is fine to say that for an object flying past a massive object, the spacetime is curved by the massive object, and so the object flying past follows the curved path of the geodesic, so it "appears" ...
70
votes
12answers
54k views

How exactly does curved space-time describe the force of gravity?

I understand that people explain (in layman's terms at least) that the presence of mass "warps" space-time geometry, and this causes gravity. I have also of course heard the analogy of a blanket or ...
2
votes
3answers
135 views

How exactly does the curvature of space-time cause objects to “fall” into another object [duplicate]

Let me preface this by saying that I'm a high school student so my knowledge of GR might be seriously flawed. As far as I'm concerned, Einstein's theory of GR states that matter curves the fabric of ...
1
vote
3answers
131 views

Why do we fall towards earth and not hover during free fall as per General relativity? [duplicate]

So this is what I understand from General Theory of Relativity: A body freely falling towards earth's surface would be in an inertial frame of reference (air removed) with zero net force acting on it. ...
2
votes
2answers
177 views

Gravity and spacetime bending [duplicate]

Something that puzzles me if gravity is just bending of space time near a mass then what is gravitational force? If say two massive bodies were perfectly at rest relative to each other they would ...
4
votes
3answers
111 views

According to general relativity, why are two objects at rest attracted to each other? [duplicate]

I'm trying to understand gravity in General Relativity and I'm having some questions. I can understand that an object in orbit around another more massive object is free falling and simply following a ...
1
vote
1answer
202 views

Stationary Object in Curved Space Time [duplicate]

Things I know already 1) Rubber sheet analogy of GR is yet another misleading piece of info 2) differential geometry makes sense 3) equivalence principle makes sense 4) special relativity makes sense ...
1
vote
1answer
198 views

Is gravity due to the curvature of spacetime? [duplicate]

Having looked at this question online, multiple sources overwhelmingly support the statement that 'Gravity results from the curvature of space-time due to mass-energy'. However, discussions on the H-...
0
votes
2answers
132 views

A problem with how curved spacetime explains gravity [duplicate]

I've read quite a few online explanations of how curved spacetime is the reason objects are drawn to each other, and that gravity is an illusion. Most of them follow the same path: explain what ...
0
votes
1answer
112 views

In general relativity, what makes an object released in a gravitational field START to fall? [duplicate]

I understand why a released object moves as it does once it has started moving, and why all objects fall at the same speed, removing other effects. But I don't see why the curvature of space would ...
1
vote
0answers
92 views

How does bending in space-time caused by mass energy translate into acceleration of object? [duplicate]

Let say we have 2 similar apples separated by a distance apart, just their mass energy alone is sufficient to cause bending in the space-time. I think it is this bending in the space-time that cause ...
1
vote
1answer
77 views

What causes force on a body in gravitationally curved space time? [duplicate]

take the example of earth sun system. The earth is said to orbit around sun because the sun bends the space time around it . Now if by some means we stop earth in its path such that its at rest with ...
0
votes
0answers
60 views

It is about spacetime and Gravity [duplicate]

if the gravity is the curvature in Spacetime due to this the earth revolves around the sun so does the curvature of spacetime applies force on the earth to move around the sun?
0
votes
1answer
93 views

Why time is attached with space and how apple fall according to Einstein? [duplicate]

As per Einstein space is flexible it means it can be curved with mass but I am not able to visualize the relationship between space and time (space-time continuum). According to Newton Apple falls ...
0
votes
0answers
48 views

Reason for gravitational force [duplicate]

What is the reason for the existence of gravitational force between two bodies? Why do we say it as an attractive force? What makes any two objects to attract each other?

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