From Centripetal Forces to Conic Orbits: A Path through the Early Sections of Newton's Principia (2007)
In this study, we test the security of a crucial plank in the Principia's mathematical foundation, namely Newton's path leading to his solution of the famous Inverse Kepler Problem: a body attracted toward an immovable center by a centripetal force inversely proportional to the square of the distance from the center must move on a conic having a focus in that center. This path begins with his definitions of centripetal and motive force, moves through the second law of motion, then traverses Propositions I, II, and VI, before coming to an end with Propositions XI, XII, XIII and this trio's first corollary. To test the security of this path, we answer the following questions. How far is Newton's path from being truly rigorous? What would it take to clarify his ambiguous definitions and laws, supply missing details, and close logical gaps? In short, what would it take to make Newton's route to the Inverse Kepler Problem completely convincing? The answer is very surprising: it takes far less than one might have expected, given that Newton carved this path in 1687.
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