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Action (physics)

In physics, action is a scalar quantity that describes how the balance of kinetic versus potential energy of a physical system changes with trajectory. Action is significant because it is an input to the principle of stationary action, an approach to classical mechanics that is simpler for multiple objects. Action and the variational principle are used…

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Common symbols
S
Dimension
M ⋅ L 2 ⋅ T − 1 {\displaystyle {\mathsf {M}}{\cdot }{\mathsf {L}}^{2}{\cdot }{\mathsf {T}}^{-1}}
In SI base units
kg⋅m2⋅s−1
Other units
J⋅Hz−1
SI unit
joule-second

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Definitions

Action principles and related ideas

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Map overview Semantic statistics

Action (physics)

Nodes97
Edges96
Triples11
Avg. degree1.98
Density0.020619
Components1

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Action (physics)

Top relations

Common symbols · 1
Action (physics) → S
Dimension · 1
Action (physics) → M ⋅ L 2 ⋅ T − 1 {\displaystyle {\mathsf {M}}{\cdot }{\mathsf {L}}^{2}{\cdot }{\mathsf {T}}^{-1}}
In SI base units · 1
Action (physics) → kg⋅m2⋅s−1
Other units · 1
Action (physics) → J⋅Hz−1
SI unit · 1
Action (physics) → joule-second

Important terminology Word statistics

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Important terminology

action principle path mechanics integral time quantum system classical physical stationary energy equations lagrangian displaystyle trajectory motion function hamilton's functional

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Action (physics)Common symbolsS1.00infobox
Action (physics)DimensionM ⋅ L 2 ⋅ T − 1 {\displaystyle {\mathsf {M}}{\cdot }{\mathsf {L}}^{2}{\cdot }{\mathsf {T}}^{-1}}1.00infobox
Action (physics)In SI base unitskg⋅m2⋅s−11.00infobox
Action (physics)Other unitsJ⋅Hz−11.00infobox
Action (physics)SI unitjoule-second1.00infobox
positioninstance ofwhich describe how physical quantities0.80text
momentum change continuously with timeinstance ofwhich describe how physical quantities0.80text
space or a generalization thereofinstance ofwhich describe how physical quantities0.80text
the electromagneticinstance ofbut also to classical fields0.80text
gravitational fieldsinstance ofbut also to classical fields0.80text
noncommutative geometryinstance ofgiven certain features0.80text

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    Min side: 3
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