Velocity

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,... more

by Kim Sy Ok

Title

Velocity

Artist

Kim Sy Ok

Medium

Digital Art

Description

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.[1] 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/s￿) ￿ 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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Uploaded

August 14th, 2012