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Has it ever been proved that gravity is proportional to mass?
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<blockquote data-quote="Mojo" data-source="post: 5324504" data-attributes="member: 230877"><p>I think the issue here is that every one who has commented on this thread so far is assuming that the gravitational force referred to in the initial post is the gravitational force between Earth and another object, whereas I believe that the initial post was referring to the gravitational force between any two objects in space time.</p><p> </p><p>Newtons law of gravitation assumes that there is a force between any two objects in space which attract them to each other and that this force is inversely proportional to the square of the distance between the two objects, where as it is directly proportional to the multiple of the mass of two objects.</p><p> </p><p>The constant (9.8 m/s^2) is the gravitational acceleration which is a constant for earth ( assuming newtons gravitational law is correct) . But this does not in any way imply that the gravitational force between the earth and any other object is constant . In fact it never is , since its dependant on the mass of the other object and the displacement between the earth and that object.</p><p> </p><p>I think in modern physics, a somewhat different proposition has been forwarded which is attempting to explain gravitational attraction. This proposition suggests that massive objects ( i.e. any object with a mass ) warps the space time around it, and therefore it gives rise to an illusion of one object attracting the other , where as there is no real force between the two objects called gravitational attraction.</p><p> </p><p>For example, if we take a black hole singularity, the mass at the center of the blackhole is infinite, and this will bend the space time around the black hole in such a manner that space-time will collapse in on the blackhole giving the illusion that objects that get close to the black hole are sucked inside, whereas what really happens is that the space time for those objects is warped in a manner where it appears to collapse in on the blackhole RELATIVE to a distant observer who is far enough to not have his/her space time significantly bent by the black hole. Therefore , the gravitational pull between two objects according to this model, is observer dependant, and is the relative difference between the spacetime warp caused by the more massive object , on the spacetime adjacent to the smaller object, and that of the observer</p></blockquote><p></p>
[QUOTE="Mojo, post: 5324504, member: 230877"] I think the issue here is that every one who has commented on this thread so far is assuming that the gravitational force referred to in the initial post is the gravitational force between Earth and another object, whereas I believe that the initial post was referring to the gravitational force between any two objects in space time. Newtons law of gravitation assumes that there is a force between any two objects in space which attract them to each other and that this force is inversely proportional to the square of the distance between the two objects, where as it is directly proportional to the multiple of the mass of two objects. The constant (9.8 m/s^2) is the gravitational acceleration which is a constant for earth ( assuming newtons gravitational law is correct) . But this does not in any way imply that the gravitational force between the earth and any other object is constant . In fact it never is , since its dependant on the mass of the other object and the displacement between the earth and that object. I think in modern physics, a somewhat different proposition has been forwarded which is attempting to explain gravitational attraction. This proposition suggests that massive objects ( i.e. any object with a mass ) warps the space time around it, and therefore it gives rise to an illusion of one object attracting the other , where as there is no real force between the two objects called gravitational attraction. For example, if we take a black hole singularity, the mass at the center of the blackhole is infinite, and this will bend the space time around the black hole in such a manner that space-time will collapse in on the blackhole giving the illusion that objects that get close to the black hole are sucked inside, whereas what really happens is that the space time for those objects is warped in a manner where it appears to collapse in on the blackhole RELATIVE to a distant observer who is far enough to not have his/her space time significantly bent by the black hole. Therefore , the gravitational pull between two objects according to this model, is observer dependant, and is the relative difference between the spacetime warp caused by the more massive object , on the spacetime adjacent to the smaller object, and that of the observer [/QUOTE]
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