Velocity | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-24

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Velocity


00:01:01 1 Constant velocity vs acceleration
00:01:40 2 Distinction between speed and velocity
00:02:41 3 Equation of motion
00:02:50 3.1 Average velocity
00:05:49 3.2 Instantaneous velocity
00:07:47 3.3 Relationship to acceleration
00:09:01 3.3.1 Constant acceleration
00:09:40 3.4 Quantities that are dependent on velocity
00:13:30 4 Relative velocity
00:16:16 4.1 Scalar velocities
00:18:01 5 Polar coordinates
00:18:57 6 See also
00:23:23 7 Notes



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SUMMARY
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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).  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 speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s) or as the SI base unit of (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 has a changing velocity and is said to be undergoing an acceleration.