Aharonov–Bohm effect: Difference between revisions
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{{Distinguish|Momentum}} | |||
{{For|the mathematical concept|Moment (mathematics)}} | |||
{{For|the moment of a force|Torque}} | |||
{{Classical mechanics|cTopic=Fundamental concepts}} | |||
In [[physics]], '''moment''' relates to the perpendicular distance from a point to a line or a surface, and is derived from the mathematical concept of [[Moment (mathematics)|moments]].<ref>Robertson, D.G.E.; Caldwell, G.E.; Hamill, J.; Kamen, G.; and Whittlesey, S.N. (2004) Research Methods in Biomechanics. Champaign, IL:Human Kinetics Publ., p. 285.</ref> It is frequently used in combination with other physical quantities as in ''moment of inertia'', ''moment of force'', ''moment of momentum'', ''magnetic moment'' and so on. | |||
''Moment'' is also used colloquially for different physical quantities that depend upon distance. For example, in engineering and kinesiology the term ''moment'' is often used instead of the more complete term [[torque|moment of force]]. A moment of force is the product of the distance of a force from an axis times the magnitude of the force, i.e., ''F'' × ''d'', where ''F'' is the magnitude of the force and ''d'' is the moment of the force. See [[torque]] for a more complete description of moments of force or [[couple (mechanics)|couple]] for the related concept ''free moment of force'' also known as a force couple. | |||
It may also be used when the distance is squared, as in [[moment of inertia]]. The moment of inertia is the "[[moment (mathematics)|second moment]]" of [[mass]] of a physical object. This is the object's resistance or [[inertia]] to changes in its angular motion. It is roughly the sum of the squared distances (i.e., moments) of the object's mass particles about a particular axis <math>(I = \int r^2 dm)</math>. | |||
== See also == | |||
*[[Mechanical equilibrium]] – applies when an object is balanced so that the sum of the clockwise moments about a pivot is equal to the sum of the anticlockwise moments about the same pivot | |||
*[[Moment of force]] – see also the article [[couple (mechanics)]] | |||
*[[Moment of inertia]] – <math>(I = \Sigma m r^2)</math> is analogous to [[mass]] in discussions of rotational motion. | |||
*[[Angular momentum|Moment of momentum]] – <math>(\mathbf{L} = \mathbf{r} \times m\mathbf{v})</math> is the rotational analog of linear [[momentum]]. | |||
*[[Magnetic moment]] – <math>(\mathbf{\mu}=I\mathbf{A})</math> is a [[dipole]] moment measuring the strength and direction of a magnetic source. | |||
*[[Electric dipole moment]] – a dipole moment measuring the charge difference and direction between two or more charges. For example, the electric dipole moment between a charge of ''–q'' and ''q'' separated by a distance of '''d''' is <math>(\mathbf{p}=q \mathbf{d})</math> | |||
*[[List of area moments of inertia]] | |||
*[[List of moments of inertia]] | |||
== References == | |||
{{Reflist}} | |||
== External links == | |||
{{Wiktionary|moment}} | |||
[[Category:Physical quantities]] | |||
[[Category:Length]] | |||
[[bg:Момент на сила]] | |||
[[el:Ροπή]] | |||
[[sq:Momenti]] | |||
[[tr:Moment (fizik)]] |
Revision as of 23:44, 16 January 2014
Template:Distinguish 28 year-old Painting Investments Worker Truman from Regina, usually spends time with pastimes for instance interior design, property developers in new launch ec Singapore and writing. Last month just traveled to City of the Renaissance. 28 year-old Painting Investments Worker Truman from Regina, usually spends time with pastimes for instance interior design, property developers in new launch ec Singapore and writing. Last month just traveled to City of the Renaissance. Template:Classical mechanics
In physics, moment relates to the perpendicular distance from a point to a line or a surface, and is derived from the mathematical concept of moments.[1] It is frequently used in combination with other physical quantities as in moment of inertia, moment of force, moment of momentum, magnetic moment and so on.
Moment is also used colloquially for different physical quantities that depend upon distance. For example, in engineering and kinesiology the term moment is often used instead of the more complete term moment of force. A moment of force is the product of the distance of a force from an axis times the magnitude of the force, i.e., F × d, where F is the magnitude of the force and d is the moment of the force. See torque for a more complete description of moments of force or couple for the related concept free moment of force also known as a force couple.
It may also be used when the distance is squared, as in moment of inertia. The moment of inertia is the "second moment" of mass of a physical object. This is the object's resistance or inertia to changes in its angular motion. It is roughly the sum of the squared distances (i.e., moments) of the object's mass particles about a particular axis .
See also
- Mechanical equilibrium – applies when an object is balanced so that the sum of the clockwise moments about a pivot is equal to the sum of the anticlockwise moments about the same pivot
- Moment of force – see also the article couple (mechanics)
- Moment of inertia – is analogous to mass in discussions of rotational motion.
- Moment of momentum – is the rotational analog of linear momentum.
- Magnetic moment – is a dipole moment measuring the strength and direction of a magnetic source.
- Electric dipole moment – a dipole moment measuring the charge difference and direction between two or more charges. For example, the electric dipole moment between a charge of –q and q separated by a distance of d is
- List of area moments of inertia
- List of moments of inertia
References
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bg:Момент на сила el:Ροπή sq:Momenti tr:Moment (fizik)
- ↑ Robertson, D.G.E.; Caldwell, G.E.; Hamill, J.; Kamen, G.; and Whittlesey, S.N. (2004) Research Methods in Biomechanics. Champaign, IL:Human Kinetics Publ., p. 285.