# Thread: gravitational force

1. So any object with mass has gravity. Does this gravity (pull) also exert a push? And how does that affect space-time? I guess what I'm asking is: does gravity push or pull space-time? Does it stretch or compact it? I imagine it should have to do both, it cannot be stretched without being compacted somewhere, but in the immediate area of the object in question?

2.

3. There are lots of planets which has less and less gravity and i seriously believe there are some which has no gravity i dont think it has anything to do with mass or rotation there is something else there

4. No planet can have no gravity. That's just silly. Gravity is needed to hold the planet together!

5. Originally Posted by Seraphimas
So any object with mass has gravity. Does this gravity (pull) also exert a push? And how does that affect space-time? I guess what I'm asking is: does gravity push or pull space-time? Does it stretch or compact it? I imagine it should have to do both, it cannot be stretched without being compacted somewhere, but in the immediate area of the object in question?
Gravity only pulls, never pushes. It causes a curvature (not "compression" or "stretch") of space-time which causes changes in motion which we interpret as the force of gravity.

6. Originally Posted by Strange
Gravity only pulls, never pushes. It causes a curvature (not "compression" or "stretch") of space-time which causes changes in motion which we interpret as the force of gravity.
There is an object in cosmology called a vacuum domain wall. Objects in fre-fall near such a wall will accelerate away from th wall. In his sense gravity does push.

7. Originally Posted by Seraphimas
So any object with mass has gravity.
Yes. It is said that the source of gravity is mass. To be precise the source of gravity is active gravitational mass. Such mass is completely defined in terms of the stress-energy-momentum tensor.

Originally Posted by Seraphimas
Does this gravity (pull) also exert a push?
It depends on the exact distribution of matter. In some instances, such as vacuum domain walls, the active gravitational mass is negative and, as a result, it pushes matter away from it.

Originally Posted by Seraphimas
And how does that affect space-time?
Suppose a object is in free-fall outside our atmosphere. He'd be ate rest in his own inertial frame of reference. His spacetime is in free-fall too. In that sense his spacetime is in free-fall. Also, when a black hole is rotating it drags spacetime around with it. In the case of the vacuum domain wall gravity pushes spacetime away from it.

8. Originally Posted by Seraphimas
So any object with mass has gravity. Does this gravity (pull) also exert a push? And how does that affect space-time? I guess what I'm asking is: does gravity push or pull space-time? Does it stretch or compact it? I imagine it should have to do both, it cannot be stretched without being compacted somewhere, but in the immediate area of the object in question?
Attraction of particle shapes dimensional space, because when the distance approaches zero at infinite attraction - the gathering space and changing direction of time is multiplies the space, so even in the most remote part , the directions have a replacement time and pushes. And creates a circular for a time

9. Originally Posted by Water Nosfim
changing direction of time
Time does not "change direction". Why do repeatedly post stuff you make up? Why don't you learn some science instead?

10. no, if u want to contradict the fact of gravitational force then i can't say much. but its still known as Attractive forces between any two objects. In this whole universe THE PULL of gravitation has not been seen. How you are asking the question? do u have seen PULL force? Its not known yet. got it? and yes the time is inversely proportional to the mass of two objects. Also Its gives the KEY IDEA to TIME TRAVELLING.

11. Originally Posted by VICTOR_LENZ
In this whole universe THE PULL of gravitation has not been seen.
Really? What is keeping me in my chair then?

12. Originally Posted by Strange
Originally Posted by Water Nosfim
changing direction of time
Time does not "change direction". Why do repeatedly post stuff you make up? Why don't you learn some science instead?
in zero size time flip \ reversed

13. Originally Posted by Water Nosfim
in zero size time flip
fnurf puggle wumpus

14. Originally Posted by VICTOR_LENZ
no, if u want to contradict the fact of gravitational force then i can't say much. but its still known as Attractive forces between any two objects. In this whole universe THE PULL of gravitation has not been seen. How you are asking the question? do u have seen PULL force? Its not known yet. got it? and yes the time is inversely proportional to the mass of two objects. Also Its gives the KEY IDEA to TIME TRAVELLING.
At the edge of the universe the push of gravity called dark matter

15. Originally Posted by VICTOR_LENZ
no, if u want to contradict the fact of gravitational force then i can't say much. but its still known as Attractive forces between any two objects. In this whole universe THE PULL of gravitation has not been seen. How you are asking the question? do u have seen PULL force? Its not known yet. got it? and yes the time is inversely proportional to the mass of two objects. Also Its gives the KEY IDEA to TIME TRAVELLING.
Gravity is a push operation back in time, and push have more simply explained

16. Unfortunately this thread is turning into gibberish, and most definately not physics. I am going to trim out some of the trash and see if I can salvage it.

17. I just though that considering Newton's third law, gravity ought to have an opposing force. If gravity is a field then maybe there is a positive and negative side. And even though mass curves space, it is also inherently in space, space runs through matter. There couldn't be a curve without a compression or stretch. I'm thinking it has something to do with the speed of said object which keeps it from altering its form in a recognizable way. Or simply the fact that it is in motion. But how exactly does mass warp space-time?

18. Originally Posted by Water Nosfim
At the edge of the universe the push of gravity called dark matter
Dark matter is thought to exist throughout the universe, not at the edge.

19. Originally Posted by Seraphimas
I just though that considering Newton's third law, gravity ought to have an opposing force. If gravity is a field then maybe there is a positive and negative side. And even though mass curves space, it is also inherently in space, space runs through matter. There couldn't be a curve without a compression or stretch. I'm thinking it has something to do with the speed of said object which keeps it from altering its form in a recognizable way. Or simply the fact that it is in motion. But how exactly does mass warp space-time?
Gravity is not like magnetism. Mass attracts (more properly, bends space) toward it. It's not like magnetism.

20. Originally Posted by Strange
What is keeping me in my chair then?
You,re specific mass is too high to start drifting as a Helium balloon :-).
Plus you,re chair is apparently strong enough.

21. Originally Posted by MeteorWayne
Gravity is not like magnetism. Mass attracts (more properly, bends space) toward it. It's not like magnetism.
There is an analogy between them though. Te buzzword is gravitomagnetism. There's an article about this in the American Journal of Physics

Analogy between general relativity and electrodynamics for slowly moving particles in weak gravitational field, Edward G. Harris, Am. J. Phys., 59(5), May 1991
Starting from the equations of general relativity, equations similar to those of the electromagnetic theory are derived. It is assumed that the particles are slowly moving (v << c), and the gravitational field is sufficiently weak that non-linear terms in Einstein's equations can be neglected. For static fields, the analogy to electrostatics and magnetostatics is very close. Results are compared with those of a previous derivation by Braginsky, Caves and Thorne [Phys. Rev. D 15, 2047-2068 (1997)]. These results lead to very simple derivations of the Lense-Thirring precession [Phys. Z. 19, 156-163 (1918) and the spin curvature force of Papepetrou [Proc. R. Soc. London Ser. A 209, 248-258 (1951)] and Pirani [Acta Phys. Pol. 15, 389-405 (1956)].
See also - Gravitoelectromagnetism - Wikipedia, the free encyclopedia

22. Originally Posted by MeteorWayne
Mass attracts toward it

It as a mutual orbit center right ?

23. If the objects are in orbit around the barycenter of their mutual system. In any case Einstein rules, and Newton gives a reasonable approximation.

24. Originally Posted by SpeedFreek
Originally Posted by Water Nosfim
At the edge of the universe the push of gravity called dark matter
Dark matter is thought to exist throughout the universe, not at the edge.
As i see it what you call universe is like a limited ara neer ather universe sperd like bubels and because you look at restrected and runde ara in the middel it subtract the far forces from raund direction

25. What does fesnickelpun droblinser thwrtroogms mean?

26. Originally Posted by MeteorWayne
What does fesnickelpun droblinser thwrtroogms mean?
You probely traslate it from hebrow

27. I start to remeber that einstein spoke translation of doich or germany

28. And " new tune " sood sunde funny ( heard )

29. Originally Posted by VICTOR_LENZ
In this whole universe THE PULL of gravitation has not been seen. How you are asking the question? do u have seen PULL force? Its not known yet. got it? and yes the time is inversely proportional to the mass of two objects. Also Its gives the KEY IDEA to TIME TRAVELLING.
What complete and utter nonsense.

30. Originally Posted by Water Nosfim
Originally Posted by SpeedFreek
Originally Posted by Water Nosfim
At the edge of the universe the push of gravity called dark matter
Dark matter is thought to exist throughout the universe, not at the edge.
As i see it what you call universe is like a limited ara neer ather universe sperd like bubels and because you look at restrected and runde ara in the middel it subtract the far forces from raund direction
Dark matter is thought to exist around galaxies, and causes them to rotate differently to how they would rotate if it were not there. You are making no sense. This is nothing to do with what I am calling the observable universe, it is to do with you either misunderstanding dark matter or dark energy, (which is what you probably meant). Both exist throughout the universe however, and are not thought to be concentrated at the edge of anything.

31. ohhhhhh i'm very sorry!!! i just written PULL instead of PUSH.... Sorry for that!!

32. Ohhhhhhhh yes!!! i'm sorry!! i wrote PULL instead of PUSH............Sorry for this one. but statement is correct

33. Originally Posted by VICTOR_LENZ
Ohhhhhhhh yes!!! i'm sorry!! i wrote PULL instead of PUSH............Sorry for this one. but statement is correct
Well, makes more sense now. Time being inversely proportional to mass is still utter nonsense, though !

34. Originally Posted by Markus Hanke
Originally Posted by VICTOR_LENZ
Ohhhhhhhh yes!!! i'm sorry!! i wrote PULL instead of PUSH............Sorry for this one. but statement is correct
Well, makes more sense now. Time being inversely proportional to mass is still utter nonsense, though !
I wonder!!!! Flow of time depends on mass.!!! don't you know??

35. Originally Posted by VICTOR_LENZ
I wonder!!!! Flow of time depends on mass.!!! don't you know??
Are you talking about space-time curvature in GR ?

36. Einstein and Newton are both fundamentally from the same field. Newtons ideals consist of things relative to us here on Earth from our viewpoints. Where as Einstein's theories didn't necessarily have to be based on Earth and could compare objects not bound by the standards and limitations here, namely: relativity and the speed of light. But even light must have some relation, as it can't escape black holes, which opens up another slew of questions. But as to the original question: Is gravity a cause or an effect? And what exactly is it's effect?

37. This thread has deteriorated into nonsense. Seraphimas, once you have received a reasonable answer to your last question I intend to lock the thread to prevent infestation by nutters.

38. Newton worked in different time, different system for math (particularly gonio) consensus.

As this Newton Pi equation : Pi/6 = arcsin 1/2.
As far as I know Newton didn,t use radials and this equation in original (this one is translated to current gonio convention I suppose) can,t have had radials for pi (as in pi= pi radials).

Another equation/formula for pi (only works on calculators using degrees ): pi = (tan1/2) * 360 or : 2pi = (tan 1/1)* 360.

39. if black holes pull things in and dont let them escape, then what are white holes

40. Hypothetical.

The idea is that the matter which goes into the singularity emerges elsewhere in space. Or another universe, take your pick.

41. Typology, I asked you to start your own thread. I will now move this comment and the last few to a new thread in the New Hypothesis section. I will ask again, do not discuss your ideas in the main sections.

http://www.thescienceforum.com/new-h...-universe.html

42. I'm no longer involved in this thread.

typology

 Bookmarks
##### Bookmarks
 Posting Permissions
 You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are On Terms of Use Agreement