accelerate

en-verb

accelerate (third-person singular simple present accelerates, present participle accelerating, simple past and past participle accelerated)

accelerates (present singular third-person)
accelerating (participle present)
accelerated (participle past)
accelerated (past)

First attested in the 1520s. Either from Latin accelerātus, perfect passive participle of accelerō (“to accelerate, hasten”) (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), formed from ad + celerō (“to hasten”), which is from celer (“quick”) (see celerity), or back-formation from acceleration.

(transitive, physics) To cause a change of velocity.


force

en-noun

force (countable and uncountable, plural forces)

From Middle English force, fors, forse, from Old French force, from Late Latin fortia, a noun derived from the neuter plural of Latin fortis (“strong”), ultimately from Proto-Indo-European *bʰerǵʰ- (“to rise, high, hill”).

der

non-rhotic, without the horse–hoarse merger

ուժեր

group that aims to attack, control, or constrain

ҡеүәт

ability to attack, control, or constrain

Torque is the rotational version of force.

Force is the result of fundamental interactions.

(physics) A physical quantity that denotes ability to push, pull, twist or accelerate a body and which has a direction and is measured in a unit dimensioned in mass × distance/time² (ML/T²): SI: newton (N); CGS: dyne (dyn)

(uncountable) The generalized abstraction of this concept.

Most physicists deem there to be four fundamental forces: the weak force, the strong force, gravitation, and the electromagnetic force.

fictitious forces

(countable) A particular form or type of force.

The Europeans tried, my goodness how they tried. But on the day the US proved too strong and too inspired. They were, dammit, just better. And when Leonard's putt dropped they clearly had the force with them as well.

1999 September 28, Mike Selvey, “Crenshaw vindicated by a chain reaction”, in The Guardian:

The dark side of the Force is a pathway to many abilities some consider to be unnatural.

2005, George Lucas, Star Wars: Episode III – Revenge of the Sith, spoken by Palpatine (Ian McDiarmid), published 2005:

(humorous or science fiction, with the, often capitalized) A metaphysical and ubiquitous power from the fictional Star Wars universe created by George Lucas. See usage note.

voima

science fiction: binding, metaphysical, and ubiquitous power

A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.

2012 March 31, Henry Petroski, “Opening Doors”, in American Scientist, volume 100, number 2, pages 112–3:

Two forces acting upon the same point on an object will cancel out only if they have equal magnitude and opposite directions.

(countable) An instance of a physical force.

Heavier objects are those that are subject to more gravitational force.

(mass noun, possibly proscribed) Force understood as something of which there can be an amount.


gravity

en-noun

gravity (countable and uncountable, plural gravities)

Learned borrowing from Latin gravitās (“weight”) (compare French gravité), from gravis (“heavy”). Doublet of gravitas. First attested in the 16th century.


jerk

Probably from Middle English yerk (“sudden motion”) and Middle English yerkid (“tightly pulled”), from Old English ġearc (“ready, active, quick”) and Old English ġearcian (“to prepare, make ready, procure, furnish, supply”). Cognate with Scots yerk (“to jerk”). Related also to English yare (“ready”).

inh

Because oral sex deprecation and anti-gay bias both have long histories among humans

many of the words for "contemptible person" come from literal terms for anyone who performs oral sex or performs anal sex; see overlap at Thesaurus:gay man

(physics, engineering) The rate of change in acceleration with respect to time.


centrifugal force

en-noun

centrifugal force (countable and uncountable, plural centrifugal forces)

Although the Citadel is equipped with mass-effect-generating element-zero cores, most of the gravity on the station is generated by the centrifugal force of rotation.

2008, BioWare, Mass Effect, Redwood City: Electronic Arts, →ISBN, →OCLC, PC, scene: Citadel Station: Statistics Codex entry:

(physics) In a rotating reference frame, the apparent force that seems to push all bodies away from the centre of rotation of the frame and is a consequence of the body's mass and the frame's angular speed. It works in conjunction with the Coriolis force to give correct motion.

(physics) In circular motion, the 'reactive' centrifugal force is a real force applied by the accelerating body that is equal and opposite to the centripetal force that is acting on the accelerating body.

(physics) In polar coordinates, the apparent radial force that acts away from the center and is a consequence of the body's angular speed around the origin.


accelerative

en-adj

accelerative (comparative more accelerative, superlative most accelerative)

more accelerative (comparative)
most accelerative (superlative)

The accelerative powers of a diesel unit like this are such that allowances for delays must be less than those with steam power: [...]

1960 April, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, pages 210–211:

Relating to acceleration; adding to velocity; quickening.


accelerograph

(geology) An instrument used to record the acceleration of the ground during an earthquake.


accelerometer

[ækˌsɛl.əˈɹɑ.mə.ɾɚ]

[ɪkˌsɛl.əˈɹɑ.mə.ɾɚ]

An instrument for measuring acceleration.


deceleration

en-noun

deceleration (countable and uncountable, plural decelerations)

acceleration

antonym(s) of “act or process of decelerating”

/diːsɛləˈɹeɪʃən/

/dɪˌsɛləˈɹeɪʃən/

The brakes produce a deceleration of 10 metres per second.

(countable) The amount by which a speed or velocity decreases (and so a scalar quantity or a vector quantity), an acceleration having a negative numerical value.


galileo

The CGS unit of acceleration, equal to 1 centimetre per second per second (1 centimeter per second squared, 1cm/s^2). Symbol: Gal


centripetal force

centripetal force (countable and uncountable, plural centripetal forces)

A Centripetal force is that by which bodies are drawn or impelled, or any way tend, towards a point as to a centre.

1726, Isaac Newton, translated by Andrew Motte, Philosophiae Naturalis Principia Mathematica, published 1729:

(physics) The force on a rotating or orbiting body in the direction of the centre of rotation.

middelpuntsoekende krag

the force on a rotating or orbiting body in the direction of the centre of rotation


angular acceleration

angular acceleration (usually uncountable, plural angular accelerations)

/ˈæŋ.ɡjʊ.lə(ɹ)əkˌsɛl.əˈɹeɪ.ʃən/

(classical mechanics) The rate of change of angular velocity, often represented by α.


decelerate

en-verb

decelerate (third-person singular simple present decelerates, present participle decelerating, simple past and past participle decelerated)

decelerates (present singular third-person)
decelerating (participle present)
decelerated (participle past)
decelerated (past)

Late 19th c., from de- + (ac)celerate. Compare deaccelerate.

In May, for example, the Illinois Central RR. introduced the long-expected streamline version of the Panama Limited, with diesel haulage, cutting the time over the 921 miles between Chicago and New Orleans by 2hr. to 18hr. each way—the fastest on record—but decelerated other trains over the same route.

1942 November and December, “Notes and News: The War and American Train Services”, in Railway Magazine, page 369:

The S.D.R. [Somerset & Dorset Railway] could not adhere to this schedule, and had to decelerate the service, but the original timings were restored when the M.R. and L.S.W.R. leased the S.D.R.

1953 August, David R. Webb, “By Rail to Bournemouth”, in Railway Magazine, page 554:

(transitive) To reduce the velocity of something.


accelerating force

en-noun

accelerating force (plural accelerating forces)

The force which causes accelerated motion.


accelerated motion

accelerated motion (countable and uncountable, plural accelerated motions)

(mechanics) Motion with a continually increasing velocity.

kiihtyvä liike

motion with a continually increasing velocity


pogo

pogo oscillation
pogo oscillation#English

(astronautics) Ellipsis of pogo oscillation, a dangerous condition where fluctuations in the thrust and acceleration produced by a rocket engine generate variations in the flow of fuel to the engine, amplifying the fluctuations of thrust and acceleration in a positive feedback cycle that can eventually tear the vehicle apart.


slow down

en-verb

slow down (third-person singular simple present slows down, present participle slowing down, simple past and past participle slowed down)

slows down (present singular third-person)
slowing down (participle present)
slowed down (participle past)
slowed down (past)

With a comfortable lead, the football team slowed down the tempo of the game.

A “moving platform” scheme[…]is more technologically ambitious than maglev trains even though it relies on conventional rails.[…]This set-up solves several problems […]. Stopping high-speed trains wastes energy and time, so why not simply slow them down enough for a moving platform to pull alongside?

2013 June 1, “Ideas coming down the track”, in The Economist, volume 407, number 8838, page 13 (Technology Quarterly):

The elimination of vacuum-braked wagons would be slowed down, and the Western Region's flirtation with diesel-hydraulic locomotives was questioned.

2023 March 8, Howard Johnston, “Was Marples the real railway wrecker?”, in RAIL, number 978, page 52:

(transitive) To reduce the velocity, speed, or tempo of something.

បង្អែរបង្អង់

bɑŋ’ae-bɑŋ’ɑŋ


speed up

speed up (third-person singular simple present speeds up, present participle speeding up, simple past and past participle speeded up or sped up)

speeds up (present singular third-person)
speeding up (participle present)
speeded up (participle past)
speeded up (past)
sped up (participle past)
sped up (past)

The car sped up as it went around the corner.

(idiomatic, intransitive) To accelerate; to increase speed.

tezləşmək

increase speed (intransitive) — see also accelerate

tezləşdirmək

increase speed (transitive) — see also accelerate


Newton's second law

directly proportional
directly proportional

(mechanics) Newton's observation that the rate of change of the momentum of a body is directly proportional to, and in the same direction as, the net force acting on it. Often stated as F = ma: F = force, m = mass, a = acceleration.


centrifuge

From French centrifuge, from Latin centrum (“center”) + fugiō (“to flee”). Equivalent to centri- + -fuge.

(figuratively) An apparatus in which humans are spun to simulate acceleration in an aircraft or spacecraft.


g-force

en-noun

g-force (countable and uncountable, plural g-forces)

The acceleration of a body, relative to the freefall acceleration due to any local gravitational field, expressed in multiples of g0 (the mean acceleration due to gravity at the Earth's surface).


grav

My heart was pounding as it pumped blood to my brain — no small job, considering my height and the gravs.

1968, Fritz Leiber, A specter is haunting Texas:

Proceed at a speed of four light years after accelerating thirteen gravs per millisecond.”

2009, Jack Davis, Will Elder, Al Jaffee, Humbug, →ISBN, page 32:

. “They're small, can maneuver faster than we can,”Clare said. “Accelerating at three gravs, too.”

2014, Gregory Benford, Larry Niven, Shipstar: A Science Fiction Novel, →ISBN:

A unit of force or acceleration equal to the standard acceleration of free fall.


proper acceleration

proper acceleration (plural proper accelerations)

(physics) The acceleration felt by an object, as opposed to the coordinate acceleration. For example the acceleration of an object at the surface of the Earth is 9.81 m/s² upwards, but has no coordinate acceleration. The proper acceleration of an object is Lorentz invariant.


antiacceleration

en-adj

antiacceleration (comparative more antiacceleration, superlative most antiacceleration)

more antiacceleration (comparative)
most antiacceleration (superlative)

(science fiction) Preventing or counteracting acceleration.


accelerating universe

en-noun

accelerating universe (plural accelerating universes)

(astronomy, astrophysics) A theory that describes and seeks to explain the seemingly increasing rate of the expansion of the universe.


Planck acceleration

Planck acceleration (plural Planck accelerations)

(physics) The acceleration from rest to the speed of light in one Planck time.


somatogravic illusion

somatogravic illusion (plural somatogravic illusions)

(aviation) An illusory perception of one's pitch angle, due to the effects of linear acceleration on the vestibular system of the inner ear.


pogo oscillation

pogo oscillation (countable and uncountable, plural pogo oscillations)

Pogo stick + oscillation; the pogo stick comparison being used to represent the longitudinal direction of the oscillation.

(astronautics) A dangerous oscillation in the fuel or structure of a rocket along the long axis induced by a surge in thrust.


centripetal acceleration

centripetal acceleration (plural centripetal accelerations)

(physics) acceleration due to centripetal force.