Portal:Physics/Selected article/February 2012

Classical mechanics describes the motion of macroscopic objects, from projectiles to parts of machinery, as well as astronomical objects, such as spacecraft, planets, stars, and galaxies. Within these domains, it produces very accurate results. And thus, is one of the oldest and largest subjects in science, engineering and technology. Besides this, many related specialties deal with gases, liquids, and solids, and so on. In addition, classical mechanics is enhanced by special relativity for high velocity objects that are approaching the speed of light. General relativity is employed to handle gravitation at a deeper level, and finally, quantum mechanics handles the wave-particle duality of atoms and molecules.

Sir Isaac Newton (4 January 1643 – 31 March 1727 or 25 December 1642 – 20 March 1727) was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian, and is considered by many scholars and members of the general public to be one of the most influential people in human history. His Philosophiæ Naturalis Principia Mathematica (Latin for "Mathematical Principles of Natural Philosophy"; usually called the Principia), published in 1687, is one of the most important scientific books ever written. It lays the groundwork for most of 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 the same set of natural laws, by demonstrating the consistency between Kepler's laws of planetary motion and his theory of gravitation; thus removing the last doubts about heliocentrism and advancing the Scientific Revolution.