action

In mechanics, the difference between kinetic energy K and potential energy V (K?V), summed over time; symbol I or S, units J.s (joule.second). Formally, action is the sum over time of the lagrangian. It is crucial to the least-action formulation of mechanics, and to the path-integral formulation of quantum theory.

Action may refer to:

In music

Action, a 2004 album by Punchline Action (music), a characteristic of a stringed instrument Action (piano) Feeling This, a song by blink-182, once released under the name Action The Action, a 1960s band "Action", a songby Powerman 5000 "Action", a song by Raven from their 1981 album Rock Until You Drop

In other areas

Action, a 1945 radio program aka Action Theater Action (comic) Action (philosophy), something a person can do. Action (supermarket chain), an Australian supermaket chain. Action (TV series) Action figure, a posable figurine. Action genre in various formats, specifically: Action film, a movie genre. Action game, a video game genre. Action programming language for Atari microcomputers Australian Capital Territory Internal Omnibus Network, a public transport company Civil action, a lawsuit. Collective action, the provision of public goods through collaboration. Direct action, a political term Firearm action, a system of operation in a firearm.