Kepler's inverse square law of gravity
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In Newton's Principia it was demonstrated that Kepler's first law- the planets follow elliptical orbits, with the sun at a focus- implies that gravity follows an 'inverse-square law', under the assumption that it is a an attrac- tive central force directed along a line from the planet to the Sun (that is, towards the .
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Newton showed that the gravitational allraction between two point bodies is proportional to the product of there masses and inversely proportional to the square of the distance between them: F =G M m/r square , where F is the force,G is the Newton's gravitational contant, M and m are the masses of the object.
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