Velocity
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Velocity is the speed and the direction of motion of an object. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.
Velocity is a physical vector quantity: both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called Template:Em, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector. If there is a change in speed, direction or both, then the object is said to be undergoing an acceleration.
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See also
- Four-velocity (relativistic version of velocity for Minkowski spacetime)
- Group velocity
- Hypervelocity
- Phase velocity
- Proper velocity (in relativity, using traveler time instead of observer time)
- Rapidity (a version of velocity additive at relativistic speeds)
- Terminal velocity
- Velocity field
- Velocity vs. time graph
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Velocity" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
