speed


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speed,

change in distance with respect to time. Speed is a scalar rather than a 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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 quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion. If during time t a body travels over a distance s, then the average speed of that body is equal to s/t. The speed and direction of a body's motion together determine the body's velocityvelocity,
change in displacement with respect to time. Displacement is the vector 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.
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Speed

The time rate of change of position of a body without regard to direction. It is the numerical magnitude only of a velocity and hence is a scalar quantity. Linear speed is commonly measured in such units as meters per second, miles per hour, or feet per second.

Average linear speed is the ratio of the length of the path traversed by a body to the elapsed time during which the body moved through that path. Instantaneous speed is the limiting value of the foregoing ratio as the elapsed time approaches zero. See Velocity

speed

[spēd]
(graphic arts)
The sensitivity of a photographic film, expressed according to one of several scales.
(mechanics)
The time rate of change of position of a body without regard to direction; in other words, the magnitude of the velocity vector.
(optics)
The light-gathering power of a lens, expressed as the reciprocal of the f number.
The time that a camera shutter is open.
(physics)
In general, the rapidity with which a process takes place.

Speed

an “illiterate loiterer”; slow-moving servant. [Br. Lit.: Two Gentlemen of Verona]

speed

1. Physics
a. a scalar measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken (average speed) or the rate of change of position with respect to time at a particular point (instantaneous speed). It is measured in metres per second, miles per hour, etc.
b. (not in technical usage) another word for velocity
2. a rate of rotation, usually expressed in revolutions per unit time
3. a gear ratio in a motor vehicle, bicycle, etc.
4. Photog a numerical expression of the sensitivity to light of a particular type of film, paper, or plate
5. Photog a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens. It increases as the f-number is decreased and vice versa
6. a slang word for amphetamine

SPEED

Early system on LGP-30. Listed in CACM 2(5):16 (May 1959).
References in periodicals archive ?
As further explained below when comparing different drive alternatives, the Hagglunds drive system gives full possibility to transform the installed power to any torque and speed combination without any time restriction.
These mineral-rich formulations are difficult to run at very high speeds," says Robert Urtel, president of Century Extruders.
A study by Napier investigated the effects of five weeks of strength training incorporating seven exercises on 20-meter sprinting speed.
The evolution of Fibre Channel creates a new dynamic for speed and connectivity that will not only enable existing applications to run faster and more reliably, but will also open the information highway to a whole new set of possibilities.
That would mean Swenson's speed would equal 1 mile [divided by] 5.
It wasn't until the mid-'80s that we had the good fortune to run into a famous speed expert named Kevin McNair whose philosophy was simple, but extremely sensible and devoid of expensive toys and gimmicks.
Through skillful programming of the PLC that controls the power to the drives, technicians can minutely adjust the speed and friction ratio of the mixing process, yielding a variety of new blends with specific characteristics.
What, then, is the optimal speed for power development in the weight-room?
Shaft-speed matching and a flying knife are said to speed roll changes.