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change in displacement with respect to time. Displacement is the vectorvector,
quantity having both magnitude and direction; it may be represented by a directed line segment. Many physical quantities are vectors, e.g., force, velocity, and momentum.
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 counterpart of distance, having both magnitude and direction. Velocity is therefore also a vector quantity. The magnitude of velocity is known as the speed of a body. The average velocity or average speed of a moving body during a time period t may be computed by dividing the total displacement or total distance by t. Computation of the instantaneous velocity at a particular moment, however, usually requires the methods of the calculus.


The time rate of change of position of a body in a particular direction. Linear velocity is velocity along a straight line, and its magnitude is commonly measured in such units as meters per second (m/s), feet per second (ft/s), and miles per hour (mi/h). Since both a magnitude and a direction are implied in a measurement of velocity, velocity is a directed or vector quantity, and to specify a velocity completely, the direction must always be given. The magnitude only is called the speed. See Speed

A body need not move in a straight line path to possess linear velocity. When a body is constrained to move along a curved path, it possesses at any point an instantaneous linear velocity in the direction of the tangent to the curve at that point. The average value of the linear velocity is defined as the ratio of the displacement to the elapsed time interval during which the displacement took place.

The representation of angular velocity ω as a vector is shown in the illustration. The vector is taken along the axis of spin. Its length is proportional to the angular speed and its direction is that in which a right-hand screw would move. If a body rotates simultaneously about two or more rectangular axes, the resultant angular velocity is the vector sum of the individual angular velocities.

Angular velocity shown as an axial vectorenlarge picture
Angular velocity shown as an axial vector



in mechanics, a kinematic quantity characterizing the motion of a point. Strictly speaking, velocity is a vector quantity and thus has both a magnitude and a direction. The magnitude, a scalar quantity, is known as speed. The term “velocity,” however, is sometimes loosely used in the sense of “speed.”

For a point in uniform motion, its speed v is equal to the ratio of the distance s traversed to the time t in which this distance is traveled—that is, v = s/t. In the general case, the instantaneous speed of a point is v = ds/dt, and the instantaneous velocity is v = dr/dt, where r is the radius vector of the point. The velocity vector is directed along the tangent to the point’s trajectory. If the motion of the point is defined by equations that express the dependence of the point’s Cartesian coordinates x, y, and z on the time t, then

where vx = dx/dt, vy= dy/dt, and vz = dz/dt. The cosines of the angles formed by the velocity vector and the coordinate axes are equal to vx/vx vy/vz and vz/v, respectively.


The time rate of change of position of a body; it is a vector quantity having direction as well as magnitude. Also known as linear velocity.
The speed at which the detonating wave passes through a column of explosives, expressed in meters or feet per second.


The rate of change of position in a given direction.


Physics a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. It is measured in metres per second, miles per hour, etc.
References in periodicals archive ?
The scene of a crash on the A69 - average speed cameras could be installed at four locations after a Highways England study Lewis Arnold
However, Brake fully supports the police's use of every tool at their disposal to enforce limits, whether they be fixed, mobile or average speed cameras.
He said average speed cameras were effective but deploying them was relatively expensive.
Maintaining the same average speed of 25mph, Al Khalaf also steered across the finishing line in the fourth and final stage with a time of 00:41:06.
The slowest A road on Teesside during rush hour was the Riverside southbound in central Stockton (A1305), where average speeds reached just 15.
Lumalabas na kahapon na pumapayag 'yung internet service providers na sabihin sa customers 'yung average speed ng internet connection nila sa bawat lugar," Engr.
Shaikh Mohammed bin Mubarak on his horse Happy from Al Zaeem Stables came second with a total time of 1h 13m 12s with an average speed of 24kph, while Al Dossary on his horse Khamon from Al Zaeem Stables came third with a total time of 1h 13m 52s with an average speed of 24kph.
Bahrain won the 67-kilometre event in a time of one hour 28 minutes 17 seconds after racing with an average speed of 46.
Riding Dudley, Shaikh Saeed completed this fast-paced ride on top with a total ride time of four hours, 40 minutes and 39 seconds averaging 25km per hour average speed.
Riding Dudley, Shaikh Saeed completed the ride in four hours, 40 minutes and 39 seconds at 25 km/h average speed.
LAST week I drove past the Average Speed Cameras that have been erected near the Conwy Tunnel in readiness for the road works due to start in the New Year.

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