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Message: <blockquote data-quote="djHiran" data-source="post: 5324290" data-attributes="member: 6429">Gravity being directly proportional to the mass of a body is only an assumption in Newtonian physics. r-girl, thats exactly what I meant. here we can start by formulating an equation for the force between two bodies A and B with masses M and m respectively.Force F = G*M*m*(1/r)^2Where r is the Newtonian distance (distance at rest) between A and B.Here G is the proportionality constant.As to what R-Girl says, G*M*(1/r)^2 = 9.81 m/s^2 and is the notion most of us generally accept. The fact is this 'magical' number is only an experimental measurement, and is subject to a certain error (error theoretically).We carry out our calculations based on the assumption, and end up with reasonable results. But it is not logical to think that our assumption is correct.For example, one can say that we stand on the inner surface of a sphere. Based on that assumption one may easily conclude that we can travel all around the world and eventually reach our starting point. Can you conclude that our assumption is correct?</blockquote>

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