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Newton's laws of motion print that page


The three laws of motion were first compiled by Sir Isaac Newton in his work Philosophiæ Naturalis Principia Mathematica , first published on July 5, 1687. [ 6 ] Newton used them to explain and investigate the motion of many physical objects and systems. [ 7 ] For example, in the third

Kepler's laws of planetary motion print that page

In astronomy , Kepler's laws give a description of the motion of planets around the Sun . Kepler's laws are: The orbit of every planet is an ellipse with the Sun at one of the two foci . A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.

wikipedia.org | 2011/10/28 6:56:53

Reactionless drive print that page

is generated without any need for any outside force or net momentum exchange to produce linear motion . The name comes from Newton's Third Law of Motion , usually expressed as: "For every action, there is an equal and opposite reaction". Such a drive would necessarily violate the conservation

wikipedia.org | 2011/7/30 8:31:52

Physics education print that page

physics courses mechanics usually is the first area of physics that is discussed. Newton's laws of motion , which describe how massive objects respond to forces, are central to the study of mechanics. Newton arrived at his three laws of motion from an extensive study of empirical data including

wikipedia.org | 2011/4/30 20:52:27

Newton's theorem of revolving orbits print that page

needed to multiply the angular speed of a particle by a factor k without affecting its radial motion (Figures 1 and 2). Newton applied his theorem to understanding the overall rotation of orbits ( apsidal precession , Figure 3) that is observed for the Moon and planets . The term "radial

wikipedia.org | 2011/4/29 7:55:40

Lagrangian mechanics print that page

frictionless bead traveling in a groove. If one is tracking the bead as a particle, calculation of the motion of the bead using Newtonian mechanics would require solving for the time-varying constraint force required to keep the bead in the groove. For the same problem using Lagrangian mechanics

wikipedia.org | 2011/5/10 11:29:09

Isaac Newton print that pageTimeline of Isaac Newton


classical mechanics . In this work, Newton described universal gravitation and the three laws of motion , which dominated the scientific view of the physical universe for the next three centuries. Newton showed that the motions of objects on Earth and of celestial bodies are governed by

Introduction to special relativity print that page


experiment , which aimed to measure differences in the relative speed of light due to the Earth's motion through the hypothetical luminiferous aether . The aether was then considered to be the medium of propagation of electromagnetic waves such as light. Einstein postulated that the speed

Centrifugal force print that page

can be analyzed either in terms of the fictitious force in the rotating coordinate system of the motion relative to a center, or in terms of the centripetal and reactive centrifugal forces seen from a non-rotating frame of reference ; these different centrifugal forces are not equal in

wikipedia.org | 2011/5/23 4:42:09

Orbit print that page


Orbits of planets are typically elliptical . Current understanding of the mechanics of orbital motion is based on Albert Einstein 's general theory of relativity , which accounts for gravity as due to curvature of space-time , with orbits following geodesics ; though in common practice an