A simple derivation of Kepler's laws without solving differential equations

Details A simple derivation of Kepler's laws without solving differential equations A simple derivation of Kepler's laws without solving differential equations

2008-12-15

arxiv.org/abs/0812.2755v1

Physics

Popular Physics

Scientific paper

10.1088/0143-0807/30/3/014

Proceeding like Newton with a discrete time approach of motion and a geometrical representation of velocity and acceleration, we obtain Kepler's laws without solving differential equations. The difficult part of Newton's work, when it calls for non trivial properties of ellipses, is avoided by the introduction of polar coordinates. Then a simple reconsideration of Newton's figure naturally leads to en explicit expression of the velocity and to the equation of the trajectory. This derivation, which can be fully apprehended by beginners at university (or even before) can be considered as a first application of mechanical concepts to a physical problem of great historical and pedagogical interest.

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