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Who said: “I seem to have been only like a boy playing on the seashore, ... finding a smoother pebble or a prettier shell ... whilst the great ocean of truth lay all undiscovered before me.”
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Home > Dictionary of Science Quotations > Scientist Names Index N > Sir Isaac Newton Quotes > Law Of Motion

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Sir Isaac Newton
(25 Dec 1642 - 20 Mar 1727)

English physicist and mathematician who made seminal discoveries in several areas of science, and was the leading scientist of his era.



And thus Nature will be very conformable to her self and very simple, performing all the great Motions of the heavenly Bodies by the Attraction of Gravity which intercedes those Bodies, and almost all the small ones of their Particles by some other attractive and repelling Powers which intercede the Particles. The Vis inertiae is a passive Principle by which Bodies persist in their Motion or Rest, receive Motion in proportion to the Force impressing it, and resist as much as they are resisted. By this Principle alone there never could have been any Motion in the World. Some other Principle was necessary for putting Bodies into Motion; and now they are in Motion, some other Principle is necessary for conserving the Motion.
— Sir Isaac Newton
From Opticks, (1704, 2nd ed. 1718), Book 3, Query 31, 372-3.
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Ax: 100 Every thing doth naturally persevere in yt state in wch it is unlesse it bee interrupted by some externall cause, hence… [a] body once moved will always keepe ye same celerity, quantity & determination of its motion.
— Sir Isaac Newton
Newton’s 'Waste Book' (1665). Quoted in Richard Westfall, Never at Rest: A Biography of Isaac Newton (1980), 145.
Science quotes on:  |  Bee (40)  |  Body (537)  |  Cause (542)  |  Determination (78)  |  External (57)  |  Interrupt (6)  |  Law Of Motion (14)  |  Motion (312)  |  Naturally (11)  |  Persevere (5)  |  Quantity (132)  |  State (491)  |  Thing (1915)  |  Will (2354)

Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by forces impressed.
— Sir Isaac Newton
The Principia: Mathematical Principles of Natural Philosophy (1687), 3rd edition (1726), trans. I. Bernard Cohen and Anne Whitman (1999), Axioms, or Laws of Motion, Law 1, 416.
Science quotes on:  |  Being (1278)  |  Body (537)  |  Change (595)  |  Force (488)  |  Forward (102)  |  Impress (65)  |  Impressed (38)  |  Law Of Motion (14)  |  Rest (281)  |  State (491)  |  Straight (73)

Impressed force is the action exerted on a body to change its state either of resting or of moving uniformly straight forward.
— Sir Isaac Newton
The Principia: Mathematical Principles of Natural Philosophy (1687), 3rd edition (1726), trans. I. Bernard Cohen and Anne Whitman (1999), Definition 4, 405.
Science quotes on:  |  Action (328)  |  Body (537)  |  Change (595)  |  Exert (39)  |  Force (488)  |  Forward (102)  |  Impress (65)  |  Impressed (38)  |  Law Of Motion (14)  |  Rest (281)  |  State (491)  |  Straight (73)

Inherent force of matter is the power of resisting by which every body, so far as it is able, perseveres in its state either of resting or of moving uniformly straight forward.
— Sir Isaac Newton
The Principia: Mathematical Principles of Natural Philosophy (1687), 3rd edition (1726), trans. I. Bernard Cohen and Anne Whitman (1999), Definition 3, 404.
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It seems to me farther, that these Particles have not only a Vis inertiae, accompanied with such passive Laws of Motion as naturally result from that Force, but also that they are moved by certain active Principles, such as that of Gravity, and that which causes Fermentation, and the Cohesion of Bodies. These Principles I consider, not as occult Qualities, supposed to result from the specifick Forms of Things, but as general Laws of Nature, by which the Things themselves are form'd; their Truth appearing to us by Phaenomena, though their Causes be not yet discover'd. For these are manifest Qualities, and their Causes only are occult.
— Sir Isaac Newton
From Opticks, (1704, 2nd ed. 1718), Book 3, Query 31, 376-377.
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Law 2: A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.
— Sir Isaac Newton
The Principia: Mathematical Principles of Natural Philosophy (1687), 3rd edition (1726), trans. I. Bernard Cohen and Anne Whitman (1999), Axioms, or Laws of Motion, Law 2, 416.
Science quotes on:  |  Change (595)  |  Force (488)  |  Impress (65)  |  Impressed (38)  |  Law (895)  |  Law Of Motion (14)  |  Motion (312)  |  Motive (59)  |  Proportion (136)  |  Straight (73)  |  Straight Line (32)

To any action there is always an opposite and equal reaction; in other words, the actions of two bodies upon each other are always equal and always opposite in direction.
— Sir Isaac Newton
The Principia: Mathematical Principles of Natural Philosophy (1687), 3rd edition (1726), trans. I. Bernard Cohen and Anne Whitman (1999), Axioms, or Laws of Motion, Law 3, 417.
Science quotes on:  |  Action (328)  |  Direction (175)  |  Force (488)  |  Law Of Motion (14)  |  Opposite (104)  |  Other (2236)  |  Reaction (104)  |  Two (937)  |  Word (622)


See also:
  • 25 Dec - short biography, births, deaths and events on date of Newton's birth.
  • Isaac Newton - biography from Famous Men of Science (1889)
  • Isaac Newton - Comments on his “Playing on the Seashore” Quote
  • Isaac Newton - “Playing on the Seashore” illustrated quote - Medium 500px.
  • Isaac Newton - “Playing on the Seashore” illustrated quote - Large 800px.
  • Isaac Newton - context of quote “A change in motion” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “A change in motion” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “In experimental philosophy” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “In experimental philosophy” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Standing on the shoulders of giants” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Standing on the shoulders of giants” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Impressed force is the action” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Impressed force is the action” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Inherent force of matter is the power of resisting…” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Inherent force of matter is the power of resisting…” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Plato is my friend” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Plato is my friend” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Colours which appear through the Prism ” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Colours which appear through the Prism ” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Nature does nothing in vain” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Nature does nothing in vain” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “No more causes of natural things should be admitted” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “No more causes of natural things should be admitted” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Truth is ever to be found in simplicity” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Truth is ever to be found in simplicity” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “Every body perseveres in its state of being at rest” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “Every body perseveres in its state of being at rest” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “God, in the beginning, formed matter” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “God, in the beginning, formed matter” - Large image (800 x 400 px)
  • Isaac Newton - context of quote “The cause of gravity is what I do not pretend to know” - Medium image (500 x 250 px)
  • Isaac Newton - context of quote “The cause of gravity is what I do not pretend to know” - Large image (800 x 400 px)
  • Sir Isaac Newton’s Apple-Tree - debunking the myth, from Historic Ninepins: A Book of Curiosities by John Timbs (1869)
  • Newton and the Dog - debunking the myth about Newton’s dog Diamond.
  • Booklist for Isaac Newton.

Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Quotations by:Albert EinsteinIsaac NewtonLord KelvinCharles DarwinSrinivasa RamanujanCarl SaganFlorence NightingaleThomas EdisonAristotleMarie CurieBenjamin FranklinWinston ChurchillGalileo GalileiSigmund FreudRobert BunsenLouis PasteurTheodore RooseveltAbraham LincolnRonald ReaganLeonardo DaVinciMichio KakuKarl PopperJohann GoetheRobert OppenheimerCharles Kettering  ... (more people)

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