Exploring the Fascinating World of Gravity: Causes and Questions Answered

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In summary: Originally posted by russ_watters The mathematics of general relativity is identical to that of curved spaces. So visualing tidal forces as a ball on a rubber sheet is often used.However not all gravitational fields have curvature. For example: There is zero spacetime curvature associated with a uniform gravitational field.
  • #1
I'm apologize if this has already been adressed in other posts, but what is gravity. I know that it is the attractive force between masses, but what causes this attraction?
 
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  • #2
but what causes this attraction?

Good question. Unfortunatly Physics cannot provide an answer. We can quantify and decribe but we cannot explain why.
 
  • #3
Originally posted by spinning head
I'm apologize if this has already been adressed in other posts, but what is gravity. I know that it is the attractive force between masses, but what causes this attraction?

The short answer is - Nobody knows.

Pete
 
  • #4
Yep - nobody knows.
In an effort to make this thread worth while - I'll toss something up.

I've been bouncing the idea around that a gravitational field works on a strictly mechanical basis. That an encounter with any gravitational field is the equivalent to an encounter with the particles themselves. That the field is the particle and the particle is the field? Yipes! Send this guy some prozak!

In other words - A particle is a collection of localized fields .. where half of a field is localized (particle), while it's other half progresses outward as a gravitational field. This happens because the fields are in orbit as opposed to say a free ranging photon field that is not. A gravitational field would eminate outward in a spiral fashion (due to it's orbit). Within this spiraled gravitational field are waves. These waves are the equivalent of gears. When gravitational fields momentarily interact - the gears mesh...thereby pushing or pulling accordingly.
 
  • #5
Arc_central,

Don't post your crackpot nonsense in this forum, ESPECIALLY not in response to a bona fide question.

- Warren
 
  • #6
Originally posted by chroot
Arc_central,

Don't post your crackpot nonsense in this forum, ESPECIALLY not in response to a bona fide question.

- Warren

chroot - Friendly request - Please don't respond in this manner. He's clearly stating that this is something that his something he's been 'bouncing around" and is tossing out there for lack of a better answer. There's no reason to chastize someone for thinking out loud and telling someone his idea.

Pete
 
  • #7
Originally posted by Integral
Good question. Unfortunatly Physics cannot provide an answer. We can quantify and decribe but we cannot explain why.
Well, there is always the warping of space-time like a bowling ball on a trampoline (except in 3d). But then, is that just a model that works or a real representattion of a physical reality? And that still of course doesn't explain HOW mass warps space.
 
  • #8
Originally posted by russ_watters
Well, there is always the warping of space-time like a bowling ball on a trampoline (except in 3d).
I don't like this model. You have to assume gravity exists in the model in order for other objects to be motivated to roll down hill (or even for the bowling ball to warp the trampoline in the first place). If the trampoline is in deep space, there would be no sensible model, and the reason is that the model already assumes gravity exists to show why it exists. You could say that the trampoline is accelerating upwards, and anything on its surface will warp it. This is pretty close to the model of GR, but, it still has the problem of "why is the trampoline accelerating?"
 
  • #9
An object rolling on a trampoline (accelerating or not) is not a direct physical model of gravitation in curved spacetime. If you model space as a curved surface like a trampoline, objects in free fall don't generally roll "downhill".

Anyway, in general relativity, objects in free fall move in the absence of force, so they obey Newton's law: an object in motion travels in a straight line when not acted upon by an outside force. It's just that a "straight line" in curved spacetime isn't a Euclidean line. None of this requires the notion of some force that makes things roll down hills or anything.
 
  • #10
Originally posted by russ_watters
Well, there is always the warping of space-time like a bowling ball on a trampoline (except in 3d). But then, is that just a model that works or a real representattion of a physical reality? And that still of course doesn't explain HOW mass warps space.
The mathematics of general relativity is identical to that of curved spaces. So visualing tidal forces as a ball on a rubber sheet is often used.

However not all gravitational fields have curvature. For example: There is zero spacetime curvature associated with a uniform gravitational field.


Pete
 

1. What is gravity and how does it work?

Gravity is a natural phenomenon that causes objects with mass to attract each other. It is the force that holds the planets in orbit around the sun and keeps objects on Earth from floating away into space. According to Einstein's theory of general relativity, gravity is the result of the curvature of space-time caused by the presence of mass.

2. What are the causes of gravity?

The main cause of gravity is the presence of mass. The more mass an object has, the stronger its gravitational pull. This is why larger objects, such as planets, have a stronger gravitational pull than smaller objects, such as rocks. Additionally, the closer two objects are, the stronger their gravitational attraction will be.

3. How does gravity affect our daily lives?

Gravity plays a crucial role in our daily lives. It keeps us on the ground and prevents us from floating away. It also affects the tides, helps plants grow, and allows us to use tools like scales and measuring tapes. Without gravity, life as we know it would not be possible.

4. What are some unanswered questions about gravity?

While we have a good understanding of how gravity works, there are still some unanswered questions. For example, scientists are still trying to understand how gravity fits into the framework of quantum mechanics. They are also trying to determine the nature of dark matter, which is thought to make up a large portion of the universe's mass and has a significant influence on gravitational forces.

5. How do scientists study and measure gravity?

Scientists use various tools and techniques to study and measure gravity. Some of these include pendulums, accelerometers, and gravimeters. They also use mathematical equations, such as Newton's law of universal gravitation and Einstein's theory of general relativity, to make predictions and explain the behavior of gravity.

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