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mechanics
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{{Short description|Science concerned with physical bodies subjected to forces or displacements}}{{About|an area of scientific study||Mechanic (disambiguation)}}{{Classical mechanics |branches}}{{Quantum mechanics |background}}Mechanics (from Ancient Greek: (wikt:μηÏανική#Ancient_Greek|μηÏανική), mÄkhaniká¸, {{literal translation}} “of machines“)ENCYCLOPEDIA
, ENCYCLOPEDIA
- the content below is remote from Wikipedia
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, mechanics
, Henry George Liddell, Robert Scott
, A Greek-English Lexicon
, 1940
,www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3Dmhxaniko%2Fs
, is the area of physics concerned with the relationships between force, matter, and motion among physical objects.BOOK, Young, Hugh D., Roger A. Freedman, A. Lewis Ford, Katarzyna Zulteta Estrugo, Sears and Zemansky’s university physics: with modern physics, Pearson Education, 2020, 978-1-292-31473-0, 15th, Harlow, 62, 1104689918, Forces applied to objects result in displacements, which are changes of an object’s position relative to its environment.Theoretical expositions of this branch of physics has its origins in Ancient Greece, for instance, in the writings of Aristotle and ArchimedesDugas, Rene. A History of Classical Mechanics. New York, NY: Dover Publications Inc, 1988, pg 19.Rana, N.C., and Joag, P.S. Classical Mechanics. West Petal Nagar, New Delhi. Tata McGraw-Hill, 1991, pg 6.Renn, J., Damerow, P., and McLaughlin, P. Aristotle, Archimedes, Euclid, and the Origin of Mechanics: The Perspective of Historical Epistemology. Berlin: Max Planck Institute for the History of Science, 2010, pg 1-2. (see History of classical mechanics and Timeline of classical mechanics). During the early modern period, scientists such as Galileo Galilei, Johannes Kepler, Christiaan Huygens, and Isaac Newton laid the foundation for what is now known as classical mechanics.As a branch of classical physics, mechanics deals with bodies that are either at rest or are moving with velocities significantly less than the speed of light. It can also be defined as the physical science that deals with the motion of and forces on bodies not in the quantum realm., Henry George Liddell, Robert Scott
, A Greek-English Lexicon
, 1940
,www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3Dmhxaniko%2Fs
History
Antiquity
The ancient Greek philosophers were among the first to propose that abstract principles govern nature. The main theory of mechanics in antiquity was Aristotelian mechanics, though an alternative theory is exposed in the pseudo-Aristotelian Mechanical Problems, often attributed to one of his successors.There is another tradition that goes back to the ancient Greeks where mathematics is used more extensively to analyze bodies statically or dynamically, an approach that may have been stimulated by prior work of the Pythagorean Archytas.BOOK, Zhmud, L.,books.google.com/books?id=of-ghBD9q1QC, Pythagoras and the Early Pythagoreans, OUP Oxford, 2012, 978-0-19-928931-8, en, Examples of this tradition include pseudo-Euclid (On the Balance), Archimedes (On the Equilibrium of Planes, On Floating Bodies), Hero (Mechanica), and Pappus (Collection, Book VIII).”A history of mechanics”. René Dugas (1988). p.19. {{ISBN|0-486-65632-2}}“A Tiny Taste of the History of Mechanics”. The University of Texas at Austin.Medieval age
(File:Arabic machine manuscript - Anonym - Ms. or. fol. 3306 c.jpg|thumb|200px|Arabic machine in a manuscript of unknown date)In the Middle Ages, Aristotle’s theories were criticized and modified by a number of figures, beginning with John Philoponus in the 6th century. A central problem was that of projectile motion, which was discussed by Hipparchus and Philoponus.Persian Islamic polymath Ibn SÄ«nÄ published his theory of motion in The Book of Healing (1020). He said that an impetus is imparted to a projectile by the thrower, and viewed it as persistent, requiring external forces such as air resistance to dissipate it.JOURNAL, Espinoza, Fernando, 2005, An analysis of the historical development of ideas about motion and its implications for teaching, Physics Education, 40, 2, 141, 10.1088/0031-9120/40/2/002, 2005PhyEd..40..139E, 250809354, BOOK, The Islamic intellectual tradition in Persia, Seyyed Hossein Nasr & Mehdi Amin Razavi, Routledge, 1996, 978-0-7007-0314-2, 72, JOURNAL, 10.1111/j.1749-6632.1987.tb37219.x, Aydin Sayili, 1987, Ibn SÄ«nÄ and Buridan on the Motion of the Projectile, Annals of the New York Academy of Sciences, 500, 1, 477â482, 1987NYASA.500..477S, 84784804, Ibn Sina made distinction between ‘force’ and ‘inclination’ (called “mayl“), and argued that an object gained mayl when the object is in opposition to its natural motion. So he concluded that continuation of motion is attributed to the inclination that is transferred to the object, and that object will be in motion until the mayl is spent. He also claimed that a projectile in a vacuum would not stop unless it is acted upon, consistent with Newton’s first law of motion.On the question of a body subject to a constant (uniform) force, the 12th-century Jewish-Arab scholar Hibat Allah Abu’l-Barakat al-Baghdaadi (born Nathanel, Iraqi, of Baghdad) stated that constant force imparts constant acceleration. According to Shlomo Pines, al-Baghdaadi’s theory of motion was “the oldest negation of Aristotle’s fundamental dynamic law [namely, that a constant force produces a uniform motion], [and is thus an] anticipation in a vague fashion of the fundamental law of classical mechanics [namely, that a force applied continuously produces acceleration].“ENCYCLOPEDIA, Pines, Shlomo, Abu’l-BarakÄt al-BaghdÄdÄ« , Hibat Allah, Dictionary of Scientific Biography, 1, 26â28, Charles Scribner’s Sons, New York, 1970, 0-684-10114-9, (cf. Abel B. Franco (October 2003). “Avempace, Projectile Motion, and Impetus Theory”, Journal of the History of Ideas 64 (4), p. 521-546 [528].)Influenced by earlier writers such as Ibn Sina and al-Baghdaadi,{{citation|title=Pseudo-Avicenna, Liber Celi Et Mundi: A Critical Edition|first=Oliver|last=Gutman|publisher=Brill Publishers|year=2003|isbn=90-04-13228-7|page=193}} the 14th-century French priest Jean Buridan developed the theory of impetus, which later developed into the modern theories of inertia, velocity, acceleration and momentum. This work and others was developed in 14th-century England by the Oxford Calculators such as Thomas Bradwardine, who studied and formulated various laws regarding falling bodies. The concept that the main properties of a body are uniformly accelerated motion (as of falling bodies) was worked out by the 14th-century Oxford Calculators.Early modern age
File:Taccola first piston.jpg|thumb|First European depiction of a piston pump, by 1450}}.BOOK, Hill, Donald Routledge, A History of Engineering in Classical and Medieval Times, London, Routledge, 1996, 143, 0-415-15291-7,books.google.com/books?id=MqSXc5sGZJUC&q=Taccola+first+piston&pg=PA143, Two central figures in the early modern age are Galileo Galilei and Isaac Newton. Galileo’s final statement of his mechanics, particularly of falling bodies, is his Two New Sciences (1638). Newton’s 1687 Philosophiæ Naturalis Principia Mathematica provided a detailed mathematical account of mechanics, using the newly developed mathematics of calculus and providing the basis of Newtonian mechanics.There is some dispute over priority of various ideas: Newton’s Principia is certainly the seminal work and has been tremendously influential, and many of the mathematics results therein could not have been stated earlier without the development of the calculus. However, many of the ideas, particularly as pertain to inertia and falling bodies, had been developed by prior scholars such as Christiaan Huygens and the less-known medieval predecessors. Precise credit is at times difficult or contentious because scientific language and standards of proof changed, so whether medieval statements are equivalent to modern statements or sufficient proof, or instead similar to modern statements and hypotheses is often debatable.Modern age
Two main modern developments in mechanics are general relativity of Einstein, and quantum mechanics, both developed in the 20th century based in part on earlier 19th-century ideas. The development in the modern continuum mechanics, particularly in the areas of elasticity, plasticity, fluid dynamics, electrodynamics, and thermodynamics of deformable media, started in the second half of the 20th century.Types of mechanical bodies
The often-used term body needs to stand for a wide assortment of objects, including particles, projectiles, spacecraft, stars, parts of machinery, parts of solids, parts of fluids (gases and liquids), etc.Other distinctions between the various sub-disciplines of mechanics concern the nature of the bodies being described. Particles are bodies with little (known) internal structure, treated as mathematical points in classical mechanics. Rigid bodies have size and shape, but retain a simplicity close to that of the particle, adding just a few so-called degrees of freedom, such as orientation in space.Otherwise, bodies may be semi-rigid, i.e. elastic, or non-rigid, i.e. fluid. These subjects have both classical and quantum divisions of study.For instance, the motion of a spacecraft, regarding its orbit and attitude (rotation), is described by the relativistic theory of classical mechanics, while the analogous movements of an atomic nucleus are described by quantum mechanics.Sub-disciplines
The following are the three main designations consisting of various subjects that are studied in mechanics.Note that there is also the “theory of fields” which constitutes a separate discipline in physics, formally treated as distinct from mechanics, whether it be classical fields or quantum fields. But in actual practice, subjects belonging to mechanics and fields are closely interwoven. Thus, for instance, forces that act on particles are frequently derived from fields (electromagnetic or gravitational), and particles generate fields by acting as sources. In fact, in quantum mechanics, particles themselves are fields, as described theoretically by the wave function.Classical
File:Newtonslawofgravity.ogv|thumb|Prof. Walter Lewin explains Newton’s law of gravitation in MIT course 8.01VIDEO, Walter Lewin, October 4, 1999
, Work, Energy, and Universal Gravitation. MIT Course 8.01: Classical Mechanics, Lecture 11.
,ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-11/
, ogg, videotape, MIT OpenCourseWare, MIT OCW, Cambridge, MA US
, December 23, 2010, 1:21-10:10, lewin MIT OpenCourseWare, MIT OCWThe following are described as forming classical mechanics:
, Work, Energy, and Universal Gravitation. MIT Course 8.01: Classical Mechanics, Lecture 11.
,ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-11/
, ogg, videotape, MIT OpenCourseWare, MIT OCW, Cambridge, MA US
, December 23, 2010, 1:21-10:10, lewin MIT OpenCourseWare, MIT OCWThe following are described as forming classical mechanics:
- Newtonian mechanics, the original theory of motion (kinematics) and forces (dynamics)
- Analytical mechanics is a reformulation of Newtonian mechanics with an emphasis on system energy, rather than on forces. There are two main branches of analytical mechanics:
- Hamiltonian mechanics, a theoretical formalism, based on the principle of conservation of energy
- Lagrangian mechanics, another theoretical formalism, based on the principle of the least action
- Classical statistical mechanics generalizes ordinary classical mechanics to consider systems in an unknown state; often used to derive thermodynamic properties.
- Celestial mechanics, the motion of bodies in space: planets, comets, stars, galaxies, etc.
- Astrodynamics, spacecraft navigation, etc.
- Solid mechanics, elasticity, plasticity, or viscoelasticity exhibited by deformable solids
- Fracture mechanics
- Acoustics, sound (density, variation, propagation) in solids, fluids and gases
- Statics, semi-rigid bodies in mechanical equilibrium
- Fluid mechanics, the motion of fluids
- Soil mechanics, mechanical behavior of soils
- Continuum mechanics, mechanics of continua (both solid and fluid)
- Hydraulics, mechanical properties of liquids
- Fluid statics, liquids in equilibrium
- Applied mechanics (also known as engineering mechanics)
- Biomechanics, solids, fluids, etc. in biology
- Biophysics, physical processes in living organisms
- Relativistic or Einsteinian mechanics
Quantum
The following are categorized as being part of quantum mechanics:- Schrödinger wave mechanics, used to describe the movements of the wavefunction of a single particle.
- Matrix mechanics is an alternative formulation that allows considering systems with a finite-dimensional state space.
- Quantum statistical mechanics generalizes ordinary quantum mechanics to consider systems in an unknown state; often used to derive thermodynamic properties.
- Particle physics, the motion, structure, and reactions of particles
- Nuclear physics, the motion, structure, and reactions of nuclei
- Condensed matter physics, quantum gases, solids, liquids, etc.
Relativistic
Akin to the distinction between quantum and classical mechanics, Albert Einstein’s general and special theories of relativity have expanded the scope of Newton and Galileo’s formulation of mechanics. The differences between relativistic and Newtonian mechanics become significant and even dominant as the velocity of a body approaches the speed of light. For instance, in Newtonian mechanics, the kinetic energy of a free particle is {{math|1=E = {{sfrac|1|2}}mv2}}, whereas in relativistic mechanics, it is {{math|1=E = (γ â 1)mc2}} (where {{math|γ}} is the Lorentz factor; this formula reduces to the Newtonian expression in the low energy limit).BOOK, Landau, L., Lifshitz, E., The Classical Theory of Fields, January 15, 1980, Butterworth-Heinemann, 27, 4th Revised English, For high-energy processes, quantum mechanics must be adjusted to account for special relativity; this has led to the development of quantum field theory.BOOK, Weinberg, S., The Quantum Theory of Fields, Volume 1: Foundations, May 1, 2005, Cambridge University Press, 0-521-67053-5, xxi, 1st,Professional organizations
- Applied Mechanics Division, American Society of Mechanical Engineers
- Fluid Dynamics Division, American Physical Society
- Society for Experimental Mechanics
- Institution of Mechanical Engineers is the United Kingdom’s qualifying body for mechanical engineers and has been the home of Mechanical Engineers for over 150 years.
- International Union of Theoretical and Applied Mechanics
See also
- Action principles
- Applied mechanics
- Dynamics
- Engineering
- Index of engineering science and mechanics articles
- Kinematics
- Kinetics
- Non-autonomous mechanics
- Statics
- Wiesen Test of Mechanical Aptitude (WTMA)
References
{{Reflist}}Further reading
- Robert Stawell Ball (1871) Experimental Mechanics from Google books.
- BOOK, Lev Landau, Landau, L. D., Evgeny Lifshitz, Lifshitz, E. M., Mechanics and Electrodynamics, Vol. 1, Franklin Book Company, Inc, 1972, 978-0-08-016739-8,
External links
{{Wiktionary}}- www.physclips.unsw.edu.au/" title="web.archive.org/web/20070601020244www.physclips.unsw.edu.au/">Physclips: Mechanics with animations and video clips from the University of New South Wales
- archimedes.mpiwg-berlin.mpg.de/" title="web.archive.org/web/20060429142525archimedes.mpiwg-berlin.mpg.de/">The Archimedes Project
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