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Kim Sy Ok
Digital Art - Digital Art
In kinematics, velocity is the speed of an object and a specification of its direction of motion. Speed describes only how fast an object is moving, whereas velocity gives both how fast and in what direction the object is moving. If a car travels at 60 km/h, its speed is known. However, if the car moves at 60 km/h to the north, its velocity has now been specified. To have a constant velocity, an object must have a constant speed and motion in a constant direction. Constant direction constrains the object to motion in a straight path (the object's path does not curve). Thus, a constant velocity means motion in a straight line at a constant speed. If there is a change in speed, direction, or both, then the object is said to have a changing velocity and is accelerating. For example, a car moving at a constant 20 kilometers per hour in a circular path may have a constant speed, but does not have a constant velocity because its direction is changing. Hence, it considered to be accelerating.
Velocity is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is speed, a quantity that is measured in metres per second (m/s or ms−1) when using the SI (metric) system. For example, "5 metres per second" is a scalar and not a vector, whereas "5 metres per second east" is a vector. The rate of change of velocity (in m/s) as a function of time (in s) is acceleration (in m/s²) – how an object's speed or direction of travel changes over time, and how it is changing at a particular point in time.
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August 14th, 2012
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