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A heavier object would reach the ground faster than a lighter one dropped at the same time from the same height
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Aristotle theorized that the sun, the moon and the planets all revolved around Earth on a set of celestial spheres.
Whereas Copernicus proposed that the planets of the solar system revolved around the sun, not Earth. -
The conculsion of Gallileo's experiments were that freely falling objects experience uniform acceration regardless of mass, as long as extraneous forces, such as air resistance and friction can be minimized.
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"each thing, as far as in its power, always remains in the same state; and that constently when it is once moved, it always continues to move."
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The second law sates that "all movement is, of itself, along straight lines". This is also Newton's first law
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He explained in his three laws why the orbits of the planets are ellipes rather than circles
He ended up explaining much more in his Principia -
quantum mechanics and relativity reduce Newton's laws for larger bodies or for bodies moving more slowly