PHYS 1111L Lecture Notes - Lecture 5: Si Base Unit, Kinematics

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27 Nov 2017
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VELOCITY
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 its speed and
direction of motion (e.g. 60 km/h to the north). Velocity is an important 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 (ms1). 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.
-ZeonGrooza
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