## velocity

**-**

## velocity

**velocity**
•**banditti**, bitty, chitty, city, committee, ditty, gritty, intercity, kitty, nitty-gritty, Pitti, pity, pretty, shitty, slitty, smriti, spitty, titty, vittae, witty
•**fifty**, fifty-fifty, nifty, shifty, swiftie, thrifty
•**guilty**, kiltie, silty
•**flinty**, linty, minty, shinty
•**ballistae**, Christie, Corpus Christi, misty, twisty, wristy
•sixty
•**deity**, gaiety (*US* gayety), laity, simultaneity, spontaneity
•**contemporaneity**, corporeity, femineity, heterogeneity, homogeneity
•**anxiety**, contrariety, dubiety, impiety, impropriety, inebriety, notoriety, piety, satiety, sobriety, ubiety, variety
•moiety
•**acuity**, ambiguity, annuity, assiduity, congruity, contiguity, continuity, exiguity, fatuity, fortuity, gratuity, ingenuity, perpetuity, perspicuity, promiscuity, suety, superfluity, tenuity, vacuity
•rabbity
•**improbity**, probity
•acerbity • witchetty • crotchety
•heredity
•**acidity**, acridity, aridity, avidity, cupidity, flaccidity, fluidity, frigidity, humidity, hybridity, insipidity, intrepidity, limpidity, liquidity, lividity, lucidity, morbidity, placidity, putridity, quiddity, rabidity, rancidity, rapidity, rigidity, solidity, stolidity, stupidity, tepidity, timidity, torpidity, torridity, turgidity, validity, vapidity
•**commodity**, oddity
•**immodesty**, modesty
•**crudity**, nudity
•**fecundity**, jocundity, moribundity, profundity, rotundity, rubicundity
•absurdity • difficulty • gadgety
•majesty • fidgety • rackety
•**pernickety**, rickety
•biscuity
•**banality**, duality, fatality, finality, ideality, legality, locality, modality, morality, natality, orality, reality, regality, rurality, tonality, totality, venality, vitality, vocality
•fidelity
•**ability**, agility, civility, debility, docility, edibility, facility, fertility, flexility, fragility, futility, gentility, hostility, humility, imbecility, infantility, juvenility, liability, mobility, nihility, nobility, nubility, puerility, senility, servility, stability, sterility, tactility, tranquillity (*US* tranquility), usability, utility, versatility, viability, virility, volatility
•ringlety
•**equality**, frivolity, jollity, polity, quality
•**credulity**, garrulity, sedulity
•nullity
•**amity**, calamity
•extremity • enmity
•**anonymity**, dimity, equanimity, magnanimity, proximity, pseudonymity, pusillanimity, unanimity
•comity
•**conformity**, deformity, enormity, multiformity, uniformity
•subcommittee • pepperminty
•infirmity
•**Christianity**, humanity, inanity, profanity, sanity, urbanity, vanity
•amnesty
•**lenity**, obscenity, serenity
•**indemnity**, solemnity
•mundanity • amenity
•**affinity**, asininity, clandestinity, divinity, femininity, infinity, masculinity, salinity, trinity, vicinity, virginity
•**benignity**, dignity, malignity
•honesty
•**community**, immunity, importunity, impunity, opportunity, unity
•**confraternity**, eternity, fraternity, maternity, modernity, paternity, taciturnity
•**serendipity**, snippety
•uppity
•**angularity**, barbarity, bipolarity, charity, circularity, clarity, complementarity, familiarity, granularity, hilarity, insularity, irregularity, jocularity, linearity, parity, particularity, peculiarity, polarity, popularity, regularity, secularity, similarity, singularity, solidarity, subsidiarity, unitarity, vernacularity, vulgarity
•alacrity • sacristy
•**ambidexterity**, asperity, austerity, celerity, dexterity, ferrety, posterity, prosperity, severity, sincerity, temerity, verity
•celebrity • integrity • rarity
•**authority**, inferiority, juniority, majority, minority, priority, seniority, sonority, sorority, superiority
•mediocrity • sovereignty • salubrity
•entirety
•**futurity**, immaturity, impurity, maturity, obscurity, purity, security, surety
•touristy
•**audacity**, capacity, fugacity, loquacity, mendacity, opacity, perspicacity, pertinacity, pugnacity, rapacity, sagacity, sequacity, tenacity, veracity, vivacity, voracity
•laxity
•**sparsity**, varsity
•necessity
•**complexity**, perplexity
•**density**, immensity, propensity, tensity
•scarcity • obesity
•**felicity**, toxicity
•**fixity**, prolixity
•**benedicite**, nicety
•**anfractuosity**, animosity, atrocity, bellicosity, curiosity, fabulosity, ferocity, generosity, grandiosity, impecuniosity, impetuosity, jocosity, luminosity, monstrosity, nebulosity, pomposity, ponderosity, porosity, preciosity, precocity, reciprocity, religiosity, scrupulosity, sinuosity, sumptuosity, velocity, verbosity, virtuosity, viscosity
•paucity • falsity • caducity • russety
•**adversity**, biodiversity, diversity, perversity, university
•**sacrosanctity**, sanctity
•chastity
•**entity**, identity
•quantity • certainty
•**cavity**, concavity, depravity, gravity
•travesty • suavity
•**brevity**, levity, longevity
•velvety • naivety
•**activity**, nativity
•equity
•**antiquity**, iniquity, obliquity, ubiquity
•propinquity

## Velocity

# Velocity

Velocity, in physics, is defined as the time rate of change of the position of a body. Mathematically, velocity is a vector quantity having direction as well as magnitude (length). Speed, on the other hand, is a scalar quantity that has only magnitude. An object moving with constant velocity (v) during a particular period (t) along a straight line has a certain displacement (s). This motion is described with the equation: v = s/t.

For example, an automobile runs at a constant rate for two hours and travels north for 120 miles on a straight stretch of road. Its velocity contains both a directional and a magnitude component. Its direction is north and its magnitude (speed) is v = s/t = 120 miles/2 hours = 60 miles per hour. As seen, the magnitude of velocity is expressed in units such as miles per hour or meters per second when describing motion along a straight or curved path. The International System of Units (SI) for velocity is meters per second.

A body sometimes does not maintain constant speed during a trip. When this happens, an average velocity can be calculated. One of the simplest ways to calculate average velocity (v_{av}) is to add the initial velocity (v_{initial}) and the final velocity vfinal and divide by two; that is, v_{av} = (vinitial + vfinal)/2.

For example, an automobile that travels at v_{initial} = 55 miles per hour for the first half of a trip but then speeds up to v_{final} = 65 miles per hour for the last half of the trip, would have an average velocity of (55 miles per hour + 65 miles per hour)/2 = 60 miles per hour (that is, assuming the automobile is traveling in the same direction for the entire time, so that its directional component remains the same).

A body that is rotating about an axis has angular velocity. Angular velocity is also a vector quantity and is expressed as units of angular rotation (w) per unit of time (t) such as revolutions per minute or radians per second.

For example, if a rider on a carousel goes around once every 30 seconds, then the rider makes one 360° revolution every 30 seconds. Thus, v = w/t = 360°/30 seconds = 12%deg; per second. The SI unit for angular velocity is radians per second (where 360° equals 2π), but other units are also commonly used such as revolutions per minute (rpm).

## velocity

**velocity (symbol v)** Rate of motion of a body in a certain direction. Velocity is a vector (magnitude and direction), whereas speed, which does not specify direction, is a scalar. Velocity can also be a measurement of how quickly an object changes its position in a given direction. An object's velocity can be found in the same manner as speed, by dividing the distance

*s*it has travelled by the time

*t*taken, and this is expressed as

*v=s/t*and given in metres per second (ms

^{-1}) or kilometres/miles per hour. Velocity is then stated, for example, as ‘60kph/37mph eastward’. Positive and negative values to represent movement in opposite directions can be shown on both a velocity-time graph and a displacement-time graph (movement from a fixed position).

## velocity

ve·loc·i·ty / vəˈläsətē/ • n. (pl. -ties) the speed of something in a given direction: *the velocities of the emitted particles.* ∎ (in general use) speed: *the tank shot backward at an incredible velocity.* ∎ (also ve·loc·i·ty of cir·cu·la·tion) Econ. the rate at which money changes hands within an economy.

## Velocity

# Velocity

Velocity is the time **rate** of change of the position of a body. Mathematically, velocity is a vector quantity having direction as well as magnitude. Speed, on the other hand, is a **scalar** quantity which has only magnitude. The magnitude of velocity is expressed in units such as miles per hour or meters per second when describing **motion** along a straight or curved path. A body which is rotating about an axis has angular velocity. Angular velocity is also a vector quantity and is expressed as units of angular **rotation** per unit of time such as revolutions per minute or radians per second.

## velocity

velocity, 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. 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

**velocity** swiftness of motion XVI; rapidity of operation XVII. — (O)F. *vélocité* or L. *vēlōcitās*, f. *vēlox* swift, rapid; see -ITY.