The Invention of Centripetal Forces

We simplify Section 2 of Principia Mathematica by Isaac Newton

Proposition 1 Theorem 1

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Proposition 2 Theorem 2

Curved Movement

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Proposition 3 Theorem 3

Orbital Movement

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Proposition 4 Theorem 4

Centripetal forces

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Proposition 5 Problem 1

Perpendicular

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Proposition 6 Theorem 5

Revolutions

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Proposition 7 Problem 2

The law of centripetal force

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Proposition 8 Problem 3

Semicircle

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Proposition 9 Problem 4

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Proposition 10 Problem 5

Newton