Action (physics)  

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An explosion is a violent release of energy (sometimes mechanical, nuclear, or chemical.) Metaphorically, also used to denote a sudden increase or emotional outburst
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An explosion is a violent release of energy (sometimes mechanical, nuclear, or chemical.) Metaphorically, also used to denote a sudden increase or emotional outburst

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.

In physics, action is an attribute of the dynamics of a physical system. It is a mathematical functional which takes the trajectory, also called path or history, of the system as its argument and has a real number as its result. Generally, the action takes different values for different paths. Action has the dimensions of [energy]·[time], and its SI unit is joule-second. This is the same unit as that of angular momentum.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Action (physics)" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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