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velocity

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{adj: accelerative, acceleratory} tending to increase velocity

{adj: determinable} capable of being determined or limited or fixed
"determinable velocities"
"matters determinable by law"
<-> indeterminable

{adj: high-speed, high-velocity} operating at high speed
"a high-speed food processor"
"a high-velocity shell"

{adj: orbital} of or relating to an orbit
"orbital revolution"
"orbital velocity"

{adj: radial} relating to or moving along or having the direction of a radius
"radial velocity"

{n: Doppler radar} radar that uses the Doppler shift to measure velocity

{n: Michelson-Morley experiment} a celebrated experiment conducted by Albert Michelson and Edward Morley; their failure to detect any influence of the earth's motion on the velocity of light was the starting point for Einstein's theory of relativity

{n: Pitot tube, Pitot} measuring instrument consisting of a right-angled tube with an open end that is directed in opposition to the flow of a fluid and used to measure the velocity of fluid flow

{n: Rayleigh disk} an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity

{n: acceleration} (physics) a rate of increase of velocity
<-> deceleration

{n: ballistic pendulum} a physical pendulum consisting of a large mass suspended from a rod; its displacement is used to measure the velocity of a projectile

{n: boron chamber} an ionization chamber lined with boron or filled with boron trifluoride gas for counting low velocity neutrons

{n: change-up, change-of-pace, change-of-pace ball, off-speed pitch} a baseball thrown with little velocity when the batter is expecting a fastball

{n: constant} a number representing a quantity assumed to have a fixed value in a specified mathematical context
"the velocity of light is a constant"

{n: deceleration} (physics) a rate of decrease in velocity
<-> acceleration

{n: direction} the spatial relation between something and the course along which it points or moves
"he checked the direction and velocity of the wind"

{n: drag coefficient, coefficient of drag} the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body

{n: drive, thrust, driving force} the act of applying force to propel something
"after reaching the desired velocity the drive is cut off"

{n: escape velocity} the minimum velocity needed to escape a gravitational field

{n: fastball, heater, smoke, hummer, bullet} (baseball) a pitch thrown with maximum velocity
"he swung late on the fastball"
"he showed batters nothing but smoke"

{n: first law of motion, Newton's first law of motion, Newton's first law} a body remains at rest or in motion with a constant velocity unless acted upon by an external force

{n: fragmentation bomb, antipersonnel bomb, anti-personnel bomb, daisy cutter} a bomb with only 10 to 20 per cent explosive and the remainder consisting of casings designed to break into many small high-velocity fragments; most effective against troops and vehicles

{n: gun} a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)

{n: high gear, high} a forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed

{n: hypervelocity} excessive velocity
"the meteorites struck the earth with hypervelocity impacts"

{n: ion engine} a type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field

{n: klystron} an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation

{n: momentum} the product of a body's mass and its velocity
"the momentum of the particles was deduced from meteoritic velocities"

{n: muzzle velocity} the velocity of a projectile as it leaves the muzzle of a gun

{n: nephoscope} a measuring instrument that uses a grid for measuring the altitude, direction, and velocity of movement of clouds

{n: peculiar velocity} velocity with respect to the local standard of rest

{n: poise} a cgs unit of dynamic viscosity equal to one dyne-second per square centimeter; the viscosity of a fluid in which a force of one dyne per square centimeter maintains a velocity of 1 centimeter per second

{n: radial velocity} velocity along the line of sight toward or away from the observer

{n: reaction propulsion} propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum

{n: refractive index, index of refraction} the ratio of the velocity of light in a vacuum to that in a medium

{n: relativistic mass} (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases

{n: shock wave, blast wave} a region of high pressure travelling through a gas at a high velocity
"the explosion created a shock wave"

{n: speed, velocity} distance travelled per unit time

{n: streamline flow} flow of a gas or liquid in which the velocity at any point is relatively steady

{n: synchrocyclotron} cyclotron that achieves relativistic velocities by modulating the frequency of the accelerating electric field

{n: terminal velocity} the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

{n: turbulent flow} flow in which the velocity at any point varies erratically

{n: whizbang, whizzbang, whizbang shell} a small high-velocity shell; it makes a whizzing sound followed by a bang when it hits

{n: wind tunnel} a structure resembling a tunnel where air is blown at known velocities for testing parts of aircraft

{n: windburn} redness and irritation of the skin caused by exposure to high-velocity wind

{v: deaden} lessen the momentum or velocity of
"deaden a ship's headway"

{v: decelerate, slow, slow down, slow up, retard} lose velocity ; move more slowly
"The car decelerated"
<-> accelerate

{v: speed} travel at an excessive or illegal velocity
"I got a ticket for speeding"


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