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Universal Gravitation Law Q.

  1. Jan 28, 2010 #1
    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
     
  2. jcsd
  3. Jan 28, 2010 #2

    tiny-tim

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    Welcome to PF!

    Hello Mohammad! Welcome to PF! :smile:
    Yup! :biggrin:
    No, that is done by the electromagnetic force, between the electrons of the different molecules. :wink:
     
  4. Jan 29, 2010 #3
    Hello Mohammad! I am new here too!
    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.
     
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