Gravitation

[leonardo shawon]

ya... I just asked what works against gravitatin.

[Abhijeet Dutta]

One way I can see is of matter decay
if gravity binds particles together as intra-molecular force then the decay of the particles may be that thing which acts against it and its spontaneous too and as know it just a special case or phenomenon

[leonardo shawon]

im sorry but what is matter decay...

[tanvirab]

So, you are asking if there is something like gravity which is repulsive?

[leonardo shawon]

ya... Is there any???

[tanvirab]

Ok. Why did you say "no" when I asked about Coulomb forces. Coulomb forces have attractive and repulsive nature right?

No, there is no repulsive counterpart of gravity. That is why gravity is so important for large objects even though it is weaker than electric forces. Electric forces can cancel each other and form neutral objects. But gravity cannot cancel each other, because all gravitational force is attractive. So, they all sum and for big objects (like stars and galaxies) it becomes really large, while the electric force of stars and galaxies are almost negligible since they have equal positive and negative charge.

Binding of molecules is not due to gravity. At such small scale, gravity is negligible; the electric force is the important force in molecules.

Matter decay is not related to either of this (I assume you are talking about nuclear decay). That happens in nucleus of atoms due a force called "weak nuclear force". This has no negative counterpart either. But luckily, this only works in short distances, so at long distances it becomes negligible.

[leonardo shawon]

sorry. I dont know the natures of Columb forces.

Secondly,,, so the four fundamental forces havent any repulsive??

[tanvirab]

The Coulomb electric force is both repulsive and attractive depending on the charge.

The other three do not have any repulsive nature.

[Abhijeet Dutta]

vaiya @tanvirab apnar explanation is absolutely right.
Ami Matter decay anlam karon onno kono chara pacchilam na which is actually not against or anything to do with gravity.