Gravity question

[daryn]

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Because every object creates a gravitational pull, the strength of which depends on the mass of the objects and is inversely proportional to the distance. But as long as the mass isn't 0, there will be an attraction.

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and attraction = unbalanced force = acceleration. lestat = wrong

[tomdemaine]

But were you wrong/joking when you said

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speed of gravity? fast, baby. way faster than c.

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[daryn]

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But were you wrong/joking when you said

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speed of gravity? fast, baby. way faster than c.

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i don't think so. it's basically instantaneous, but i think it's just so fast that it can't easily be measured by science. that is only for the field to be set up though like the guy said. the force effect would travel at c.

[MrMon]

Gravity travels at the speed of light and works over all distances. But unless you have a very large mass or a very short distance, you can generally consider the effect to be zero, even though it does in fact exist. It's just so minimal as to be not significant. However, in a universe with only two masses, obviously it is significant, as it's the only field out there, no matter how much barely above zero it is.

[Cooker]

The initial velocity of the objects is important. You can easily put 2 objects in a universe in such away in which they will never collide, but the trajectory of each will be slightly different from the case where it is alone in an otherwise empty universe.

If you are talking about large objects like the Earth or a person and start them at rest, then they will eventually collide. If you are talking about electrons then the picture can be quite different, and since we really don't have a full theory of GR and QM no one can say for sure. I am sure there are cases where one can say for sure that they don't collide, but I don't one would be able to say for sure when they do collide.

Actually, for objects like electrons, even the idea of "collision" isn't really sensible since they will definitely not stick together. An electron isn't really like a ball.

[evil twin]

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Gravity travels at the speed of light and works over all distances.

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[billygrippo]

lenghty read on speed of gravity

[Ace of Spades00]

Yeah that is somthing to think about. I beliveve that an object needs to perform an action to say and a chain reaction is formed to bring the planets togeather or apart. But i really dont know physics. and also no i dont think it has a speed.

[tolbiny]

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Because every object creates a gravitational pull, the strength of which depends on the mass of the objects and is inversely proportional to the distance. But as long as the mass isn't 0, there will be an attraction.

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and attraction = unbalanced force = acceleration. lestat = wrong

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Doesn't the force have to be sufficient to overcome an objects inertia?

[evil twin]

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and also no i dont think it has a speed.

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You might want to read some of the links above where it catagorically DOES have a speed then.