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jobyts
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If the distance between two objects is zero, won't there be infinite gravitational attraction force between them? How would the objects can get separated?
Congratulations jobyts, you just discovered a problem in classical physics.jobyts said:If d is zero, won't the F be infinite?
Good question. In quantum mechanics, there is always uncertainty in position. With like-charged particles, the repulsive force will overwhelm all others, so the distance should never become zero. But with neutral or dissimilar charged particles, we have to consider further. When two dissimilar particles, (take proton and electron) are put together, you get an atom of hydrogen. The force of gravity cannot be infinite because the atom can be ionized (pulling the electron away). I would speculate that the uncertainty in position of the electron keeps the distance non-zero. I don't think two neutral particles (two neutrons) can occupy the same space because they are fermions, and thus obey the Pauli exclusion principle.jobyts said:is there a lower limit to d between two molecules/atoms
gendou2 said:Congratulations jobyts, you just discovered a problem in classical physics. When distances are very small (approaching zero in this case), you have to use quantum mechanics.
Good point, Phrak.Phrak said:It would be sufficient, to eliminate infinites, that mass density be finite.
The singularity in a black hole? :)Phrak said:I don't know of any infinitely dense masses.
gendou2 said:Good point, Phrak.
Have the mass density of the fundamental particles been measured?
I have seen fundamental particles treated as point-like particles of infinite density.
I suspect this is not how they really are, and that they should have finite density.
Also, it would be interesting to find out wether the charge density looks like the mass density (for particles that have charge).
The singularity in a black hole? :)
Gravitation Force is a fundamental force of nature that describes the attraction between two objects with mass. It is responsible for keeping planets in orbit around the sun and objects on Earth from floating away into space.
Gravitation Force is considered infinite because it is always present between any two objects with mass, regardless of the distance between them. This means that no matter how far apart two objects are, there will always be a gravitational pull between them.
Gravitation Force is caused by the mass and distance between two objects. The greater the mass of the objects and the closer they are to each other, the stronger the gravitational force.
Gravitation Force affects objects by pulling them towards each other. This can result in objects being pulled into orbit, falling towards a larger object, or being held together in a stable structure, such as a planet or star.
Gravitation Force and Separation are two opposing forces that act on objects with mass. Gravitation Force pulls objects towards each other, while Separation pushes objects away from each other. These forces are constantly in balance, and the strength of each determines the overall motion of the objects.