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Velocity Definition

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (For instance, 60 km/h to the north). Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity where both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as meters per second (m/s) or as the SI base unit of (m∙s-1). For example, 5 meters per second is a scalar, whereas 5 meters per second east is a vector. If there is a change in speed, direction or both, then the object has a changing velocity and is said to be undergoing an acceleration.

Other Length & Distance Unit Definitions

  • Agate Typographical (agate)

  • Alen Danish (alen)

  • Alen Scandinavia (alen)

  • Alen Swedish (alen)

  • Angstrom (Å)

  • Arms-Length (arms-length)

  • Arpent Canada (arpent)

  • Arpent France (arpent)

  • Arsheen Russia (арши́н)

  • Arshin Iran (arshin)

  • Arshin Iraq (arshin)

  • Astronomical Unit (au)

  • Attometer (am)

  • Bamboo (bamboo)

  • Barleycorn (barleycorn)

  • Beard-Second (beard-second)

  • Bee Space (bee space)

  • Bicron (μμ)

  • Block East USA (block-east-usa)

  • Block Midwest USA (block-midwest-usa)

  • Block South & West USA (block-south-west)

  • Bohr (a0)

  • Braccio Italy (braccio)

  • Braza Argentina (braza)

  • Braza Spain (braza)

  • Braza Texas (braza)

  • Button Measure (button-measure)

  • Cable British (cable)

  • Cable USA (cable)

  • Caliber (caliber)

  • Canna (canna)

  • Cape Foot (cf)

  • Cape Inch (ci)

  • Cape Rood (cr)

  • Centimeter (cm)

  • Centímetro (cm)

  • Ch'ih China (市尺)

  • Chain Gunter & Survey (chain)

  • Chain Ramsden & Engineer (chain)

  • Chinese Foot (市尺)

  • Chinese Inch (市寸)

  • Chinese Mile (市里)

  • Chinese Yard (市丈)

  • City Block East USA (city-block-east-usa)

  • City Block Midwest USA (city-block-midwest-usa)

  • City Block South & West USA (city-block-south-west-usa)

  • Click Military USA (click)

  • Cuadra (cuadra)

  • Cuadra Argentina (cuadra)

  • Cubit Egyptian (cubit)

  • Cubit English (cubit)

  • Cubit Roman (cubit)

  • Cubit Royal Egyptian (cubit)

  • Cuerda (cuerda)

  • Decameter (dam)

  • Decimeter (dm)

  • Dekameter (dam)

  • Didot Point (didot-point)

  • Digit (digit)

  • Diraa Egypt (diraa)

  • Dong Vietnam (dong)

  • Douzième Print (douzième)

  • Douzième Watchmaking (douzième)

  • Dra Iraq (dra)

  • Dra Russia (dra)

  • El Dutch (el)

  • Ell English (ell)

  • Ell Scotland (ell)

  • Elle Germany (elle)

  • Elle Vienna (elle)

  • Em (em)

  • Estadio Portugal (estadio)

  • Estadio Spain (estadio)

  • Exameter (Em)

  • Faden Austria (faden)

  • Faden Switzerland (faden)

  • Fall English (fall)

  • Fall Scotland (fall)

  • Fathom (fath)

  • Fathom Ancient (fath)

  • Faust Hungary (faust)

  • Femtometer (fm)

  • Fermi (fm)

  • Finger (finger)

  • Fingerbreadth (fingerbreadth)

  • Fist (fist)

  • Fod (fod)

  • Foot (ft)

  • Foot Egypt (ft)

  • Foot France (ft)

  • Foot Iraq (ft)

  • Foot Netherlands (ft)

  • Foot Pre-1963 Canada (ft)

  • Foot Rome (ft)

  • Foot Survey (ft)

  • Football Field Canada (football-field-canada)

  • Football Field Complete USA (football-field-complete-usa)

  • Football Field USA (football-field-usa)

  • Furlong International (fur)

  • Furlong Survey (fur)

  • Fuss German (fuss)

  • Gigalight Year (Gly)

  • Gigameter (Gm)

  • Gigaparsec (Gpc)

  • Gnat's Eye (gnats-eye)

  • Goad (goad)

  • Gry (gry)

  • Hair's Breadth (hairs-breadth)

  • Hand Non-Equine (hand-non-equine)

  • Handbreadth (handbreadth)

  • Hat Cambodia (hat)

  • Hectometer (hm)

  • Heer (heer)

  • Hubble (hubble)

  • Hvat Croatia (hvat)

  • Inch (in)

  • Ken Japan (ken)

  • Kerat (kerat)

  • Kilofoot (kft)

  • Kilometer (km)

  • Kiloparsec (kpc)

  • Kiloyard (kyd)

  • Kind (kind)

  • Klafter Austria (klafter)

  • Klafter Switzerland (klafter)

  • Klick (klick)

  • Kyu (kyu)

  • Lap Competition (lap)

  • Lap Old (lap)

  • Lap Olympic Pool (lap)

  • League Ancient Celtic (league)

  • League Nautical (league)

  • League Nautical UK (league)

  • League UK (league)

  • League Statute USA (league)

  • Leap (leap)

  • Legoa (legoa)

  • Legua (legua)

  • Legua Post-1568 Spanish (legua)

  • Legua Pre-1568 Spanish (legua)

  • Legua Texas (legua)

  • Li Ancient China (釐,T,厘,S)

  • Li Imperial China (釐,T,厘,S)

  • Li Modern China (釐,T,厘,S)

  • Lieue Metric France (lieue)

  • Lieue Nautical France (lieue)

  • Lieue France (lieue)

  • Light Day (ld)

  • Light Hour (lh)

  • Light Minute (lmin)

  • Light Month (lm)

  • Light Second (ls)

  • Light Week (lwk)

  • Light Year (ly)

  • Ligne France (ligne)

  • Ligne Swiss (ligne)

  • Line (li)

  • Line Small (li)

  • Linear Foot (lft)

  • Link Gunter & Survey (link)

  • Link Ramden & Engineer (link)

  • Lug (lug)

  • Lug Great (lug)

  • Marathon (marathon)

  • Mark Twain (mark-twain)

  • Megalight Year (Mly)

  • Megameter (Mm)

  • Megaparsec (Mpc)

  • Meile Austria (meile)

  • Meile Geographische (meile)

  • Meile North Germany (meile)

  • Meter (m)

  • Metric Mile (metric-mile)

  • Metric Mile High School (metric-mile)

  • Metro (metro)

  • Microinch (μin)

  • Micrometer (μm)

  • Micromicron (μμm)

  • Micron (μm)

  • Miglio (miglio)

  • Miil Mijl Danish (miil-mijl)

  • Miil Mijl Denmark (miil-mijl)

  • Miil Mijl Ancient Sweden (miil-mijl)

  • Mil (mil)

  • Mil Sweden (mil)

  • Mile (mi)

  • Mile Ancient Britain (mi)

  • Mile International (mi)

  • Mile Irish (mi)

  • Mile Nautical & International (mi)

  • Mile Nautical UK (mi)

  • Mile Nautical US (mi)

  • Mile Ancient Roman (mi)

  • Mile Scottish (mi)

  • Mile Statute International (mi)

  • Mile Statute US (mi)

  • Mile Statute (mi)

  • Mile Survey (mi)

  • Milha Portuguese (milha)

  • Milímetro (milímetro)

  • Military Pace (military-pace)

  • Military Pace Double Time (military-pace)

  • Milla Spanish (milla)

  • Mille French (mille)

  • Milliare Rome (milliare)

  • Millimeter (mm)

  • Millimicron (mμm)

  • Mkono Africa (mkono)

  • Moot India (moot)

  • Myriameter (mym)

  • Nail (nail)

  • Nanometer (nm)

  • Nanon (nanon)

  • Pace Great (pace)

  • Pace Roman (pace)

  • Palm Britain & Roman Minor (palm)

  • Palm Dutch (palm)

  • Palm US & Roman Major (palm)

  • Palmo Portuguese (palmo)

  • Palmo Spanish (palmo)

  • Palmo Texas (palmo)

  • Parasang (parasang)

  • Paris Foot (pied du roi)

  • Parsec (pc)

  • Pe Portuguese (pe)

  • Pearl (pearl)

  • Perch (perch)

  • Perch Ireland (perch)

  • Pertica (pertica)

  • Pes (pes)

  • Petameter (Pm)

  • Pica (pica)

  • Picometer (pm)

  • Pie Argentina (pie)

  • Pie Italian (pie)

  • Pie Spanish (pie)

  • Pie Texas (pie)

  • Pied Du Roi (paris foot)

  • Pik (pik)

  • Pike Greece (pike)

  • Point Adobe (pt)

  • Point Britain & US (pt)

  • Point Didot (pt)

  • Point TeX (pt)

  • Pole (pole)

  • Polegada Portuguese (polegada)

  • Pouce (pouce)

  • Pu China (pu)

  • Pulgada (pulgada)

  • Pygme Greece (pygme)

  • Q (q)

  • Quadrant (quadrant)

  • Quarter (quarter)

  • Quarter Cloth (quarter)

  • Quarter Print (quarter)

  • Range (range)

  • Reed Israel (reed)

  • Ri Japan (ri)

  • Ridge (ridge)

  • River Egypt (itrw)

  • Rod International