# 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.
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 ?
This will probably be good for many drivers, and I don't know anyone who would speed up when there are visible signs stating the speed limit followed by a sign highlighting that a speed trap is in operation.
This is about raising drivers' awareness that speed traps are out there," he said.
The offence of "willfully obstructing a constable" was first used back in the late 19th Century against AA patrolmen who'd warn motorists of speed traps ahead.
His 2003 bill, which prohibited the city from nabbing speeders on I-5, then outside city limits, was supposed to send the message, "Stop relying on an illegal speed trap to fund city services.
Police said the speed trap site was Department for Transport-approved.
Paul Fisher, 39, was banned from the roads and tagged after forcing a speed trap policeman to jump for his life by driving at him at 70mph.
Police should be clearly visible on the roadside with plenty of signs warning of a speed trap.
If they did NOT salute it meant a speed trap lay ahead.
A STUDENT who raced through a speed trap in Coventry almost knocked over a policeman, a court heard.

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