Universal Gravitation: Does It Apply to Every Particle in the Universe?

[MHD93]

Hello all,

1) Does the universal gravitation law apply to every two particles in the universe, no matter how far they are from each other?

For instance, is there a gravitation force between the pen in my hand and the farthest particle(or star) in the universe, I don't care how small this force is, but I am asking about its existence.

2) Is this law what makes the atoms of a solid material stick together, and makes it rigid?

Thanks a lot
Mohammad

 

[tiny-tim]

Welcome to PF!

Hello Mohammad! Welcome to PF!

1) Does the universal gravitation law apply to every two particles in the universe, no matter how far they are from each other?

For instance, is there a gravitation force between the pen in my hand and the farthest particle(or star) in the universe, I don't care how small this force is, but I am asking about its existence.

Yup!

2) Is this law what makes the atoms of a solid material stick together, and makes it rigid?

No, that is done by the electromagnetic force, between the electrons of the different molecules.

 

[The legend]

Hello Mohammad! I am new here too!

Hello all,

1) Does the universal gravitation law apply to every two particles in the universe, no matter how far they are from each other?

For instance, is there a gravitation force between the pen in my hand and the farthest particle(or star) in the universe, I don't care how small this force is, but I am asking about its existence.

well for this part of the question the answer is, just like tiny-tim said, Yes. Since the quantitative equation is
F=Gm₁m₂
__________________________
R²


Your pen in your hand has mass so does the distant star. Hence there is force existing but the thing is it is very very very small.