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Earths gravitational pull

  1. Apr 17, 2007 #1
    Does Earths gravitational pull intensify when it has an object to draw upon?

    hq2u
     
  2. jcsd
  3. Apr 17, 2007 #2

    Mentz114

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    Gold Member

    I see no reason why it should.
     
  4. Apr 17, 2007 #3
    Well...yes and no. Depends on what you mean by the intensity of the gravitational pull of the earth. The earth exerts a larger gravitational force on more massive objects (objects fall with the same acceleration because mass has the peculiar property of creating gravitational force, and resisting it as well). So in that sense, the "intensity" of the earth's gravitational pull is zero when it has nothing to draw upon, and the intensity increases proportionately with the mass of the object that it is pulling. If by "intensity" you mean force, then yes, the intensity of the gravitational pull of the earth certainly does depend on the presence of an object, and the intensity is zero when there's no object present.

    However, physicists have invented the concept of the gravitational field, whereby we obscure any mass that the earth might be pulling on, and talk about the force per unit mass that the earth would exert on a hypothetical point mass. The gravitational field is not dependent on the existence of any other mass, and indeed we believe that the gravitational field is there even when it has nothing to pull on. If this is what you mean by intensity, then no, intensity doesn't depend on the existence of any object for the earth to draw upon.
     
  5. Apr 17, 2007 #4

    rcgldr

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    No, but the more mass present, the stronger the gravitational field.

    While the earth's contribution to the strength of a gravitaional field isn't changed by the presence of another body of mass, the presenced of that other mass does increase the overall gravitaional intensity.
     
  6. Apr 25, 2007 #5
    Acually,yes buddy it does cause more pull upon that mass unit but the gravitational force against you (or the objes=ct) is SOOO slim its technicly imposible to identifie. (sorry its late so excuse spelling errors)
     
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