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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 ?
How our local roads measure up Road Average speed Change on in 2018 (mph) 2017 (mph) A638 17.2 -0.4 A652 17.6 -0.7 A644 18.0 0 A62 18.3 -0.2 A629 20.8 -0.4 A651 21.0 -0.7 A641 21.1 -0.2 A643 21.9 -2.1 A640 21.9 -0.4 A616 21.9 -0.2 A649 22.0 -0.4 A6024 22.5 -2.3 A653 22.5 -0.2 A6107 25.6 -1 A58 26.3 -0.4 A637 26.5 0.1 A642 29.4 -0.8 A635 29.7 -1.5 A636 30.4 -0.1 Traffic waiting to enter and exit Great Northern Retail Park on Leeds Road
-Tel Aviv, Israel, to Kiev, Ukraine, in two and 41 minutes at an average speed of Mach 0.90
A Lancashire Police spokesman said: "The introduction of the average speed camera system is intended to positively influence driver behaviour and ensure that motorists comply with the set limits on roads, resulting in a safer environment for all road users.
Worldwide, Singapore led the way with an average speed of 60.39 Mbps.
Also, main roads in Yeoksam and Bangbae in the affluent district of Gangnam both recorded average speeds of 17.9km/h, slightly above that of those in Yeouinaru.
As of 11 a.m., the average speed was less than 40 kilometers per hour on the southbound lane of Freeway No.
The report titled 'The State of LTE' stated that the average speed of a 4G line in Malaysia last year was 14.83 megabits per second (Mbps), putting it among the bottom 20 countries on the list.
The car reached a highest speed of 112mph, and an average speed of 104mph.

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