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Philosophiæ Naturalis Principia Mathematica (English: The Mathematical Principles of Natural Philosophy) [1] often referred to as simply the Principia (/ p r ɪ n ˈ s ɪ p i ə, p r ɪ n ˈ k ɪ p i ə /), is a book by Isaac Newton that expounds Newton's laws of motion and his law of universal gravitation.
Around 1666 Isaac Newton developed the idea that Kepler's laws must also apply to the orbit of the Moon around the Earth and then to all objects on Earth. The analysis required assuming that the gravitation force acted as if all of the mass of the Earth were concentrated at its center, an unproven conjecture at that time.
In the history of physics, hypotheses non fingo (Latin for "I frame no hypotheses", or "I contrive no hypotheses") is a phrase used by Isaac Newton in the essay General Scholium, which was appended to the second edition of Philosophiae Naturalis Principia Mathematica in 1713.
Sir Isaac Newton (25 December 1642 – 20 March 1726/27 [a]) was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author who was described in his time as a natural philosopher. [5] Newton was a key figure in the Scientific Revolution and the Enlightenment that followed. [6]
J. A. Lohne, "Isaac Newton: the rise of a scientist, 1661—1671" Notes and records of the Royal Society, vol 20 (1965) pp 125–139. [1] Never at rest: a biography of Isaac Newton, by Richard S. Westfall, Cambridge University Press, 1980 ISBN 0-521-23143-4; Westfall, Richard S. “The Foundations of Newton’s Philosophy of Nature.”
The existence of the gravitational constant was explored by various researchers from the mid-17th century, helping Isaac Newton formulate his law of universal gravitation. Newton's classical mechanics were superseded in the early 20th century, when Einstein developed the special and general theories of relativity.
Newton's cannonball was a thought experiment Isaac Newton used to hypothesize that the force of gravity was universal, and it was the key force for planetary motion. It appeared in his posthumously published 1728 work De mundi systemate (also published in English as A Treatise of the System of the World). [1] [2]
The quote is most often attributed to Sir Isaac Newton in a letter to his rival, Robert Hooke. Isaac Newton remarked in a letter to his rival Robert Hooke written in 5 February 1675 and published in 1855: What Des-Cartes did was a good step. You have added much several ways, & especially in taking the colours of thin plates into philosophical ...