|
|
| Line 1: |
Line 1: |
| {{Distinguish|Momentum}}
| | I'm Alexandria and I live with my husband and our three children in Den Dolder, in the UT south part. My hobbies are Radio-Controlled Car Racing, Card collecting and Driving.<br><br>Here is my blog post; Oltramare ([http://yellow.local.ch/fr/d/Geneve/1204/Fondation/Fondation-Yves-et-Inez-Oltramare-gs7984ce3Mk-AGY1YUlt_g local.ch]) |
| {{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)]]
| |
I'm Alexandria and I live with my husband and our three children in Den Dolder, in the UT south part. My hobbies are Radio-Controlled Car Racing, Card collecting and Driving.
Here is my blog post; Oltramare (local.ch)