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Thread: A push or a pull

  1. #1 A push or a pull 
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    is gravity a force that pulls?

    are we pulled down on to the earth

    or is gravity just space "squeezing" or compacting the matter within it


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  3. #2  
    Moderator Moderator Dishmaster's Avatar
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    Gravity is an attractive force. It does not matter, if it is recognised in a Newtonian style with masses being the sources of the gravitational force or in the framework of General Relativity, where gravity is caused by bent space.


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  4. #3  
    Time Lord
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    Pet theory: The net inertial force of smaller things upon larger things may simulate gravity. If the universe is infinite (i.e. no "smallest thing") then that is a constant force.

    EDIT: Having an interest in this, I have noticed the idea upwelling in recent years.
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  5. #4 Re: A push or a pull 
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    Quote Originally Posted by Jon not Ron
    is gravity a force that pulls?

    are we pulled down on to the earth

    or is gravity just space "squeezing" or compacting the matter within it
    Now that's a good question, it shows you are trying to look at things from a different angle.

    Gravity is a phenomenom, nobody can explain it's inner workings or it's source, we can however predict it's behaviour.

    If space was merely 'compacting matter' it would suggest that all matter would be 'compacted' at the same rate (since space is fairly uniform) and therefore the amount of matter would not make a difference. We know however that the effect of gravity on matter is proportional to the amount of matter. I am not sure that 'space sqeezing matter' could account for galaxies expanding or the existence of black holes.
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  6. #5  
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    I think you mean to ask, is gravity, as according to Newtonian standards, a force that pulls, or, as the Einsteinian theory of general relativity has it, the push of a curvature in space-time?

    The answer is definitely the Einsteinian notion of a pushing force.
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