# velocity

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Related to Average speed: Instantaneous speed

## velocity,

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.
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.

## Velocity

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 vector

## Velocity

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.

## velocity

[və′läs·əd·ē]
(mechanics)
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.

## velocity

The rate of change of position in a given direction.

## velocity

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 ?
Swallow, in the Senior Classic race, was ninth on his 499 Petty Manx bike, recording an average speed of 97.
Rounding off the podium was Mahmood of Al Khalidiya Stable, who managed to cross the finish line in 3:14:48 on Waterlea Oliver, with an average speed of 24km per hour.
com recorded average speeds across 12UK regions, by testing more than 138,000 connections of registered users of its site between January and May this year The survey found the average download speed in the UK was 3,238Kbps and that consumers in areas like Wales and Northern Ireland were "less likely" to have access to higher speeds offered elsewhere in Britain.
Average speeds for the corresponding mid-December week in 2002 were just 40 mph.
The concept seems to be that reducing average speeds will automatically make a road safer irrespective of how it is done.
Volvo's new S60 T5 sports saloon smashed no less than 18 British Land Speed Records last weekend (14/15 October) including the 24 hour record for highest average speed.
At this temperature, rubidium atoms move with an average speed of only 4 millimeters per second.
In the six months to May 2014, the average speed delivered by cable broadband reached 43.
And it was Shaikh Nasser who came out victorious, completing all five stages with a total ride time of five hours, 49 minutes and 50 seconds, and with a 20km average speed.
The cars also set highest average speed records over timed sessions lasting one, six, 12 and 24 hours.
THE 50mph average speed limit on the M4 was lifted yesterday.
DUE to the road works near the Kingston Bridge in Glasgow, average speed cameras have been installed.

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