# Mass

• cast iron weight used for balances – mass: 2 kg (4.44 lb) height: 4.9 cm (1.9 in); width: 9.2 cm (3.6 in)
classical mechanics part of a series of articles about ${\displaystyle {\vec {f}}=m{\vec {a}}}$second law of motion branches applied celestial continuum dynamics kinematics kinetics statics statistical fundamentals acceleration angular momentum couple d'alembert's principle energy kinetic potential force frame of reference inertial frame of reference impulse inertia / moment of inertia mass mechanical power mechanical work moment momentum space speed time torque velocity virtual work formulations newton's laws of motion analytical mechanics lagrangian mechanicshamiltonian mechanicsrouthian mechanicshamilton–jacobi equationappell's equation of motionkoopman–von neumann mechanics core topics damping (ratio) displacement equations of motion euler's laws of motion fictitious force friction harmonic oscillator inertial / non-inertial reference frame mechanics of planar particle motion motion (linear) newton's law of universal gravitation newton's laws of motion relative velocity rigid body dynamics euler's equations simple harmonic motion vibration rotation circular motion rotating reference frame centripetal force centrifugal force reactive coriolis force pendulum tangential speed rotational speed angular acceleration / displacement / frequency / velocity scientists galileo huygens newton kepler horrocks halley euler d'alembert clairaut lagrange laplace hamilton poisson daniel bernoulli johann bernoulli cauchy categories ► classical mechanics vt

mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.[1] an object's mass also determines the strength of its gravitational attraction to other bodies.

the basic si unit of mass is the kilogram (kg). in physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses. an object on the moon would weigh less than it does on earth because of the lower gravity, but it would still have the same mass. this is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force.

• phenomena
• units of mass
• definitions
• pre-newtonian concepts
• newtonian mass
• atomic mass
• in relativity
• in quantum physics
• notes
• references

## This article is about the scientific concept. For the substance of which all physical objects consist, see Matter. For the main liturgical service in some Christian churches, see Mass (liturgy). For other uses, see Mass (disambiguation). Cast iron weight used for balances – Mass: 2 kg (4.44 lb) Height: 4.9 cm (1.9 in); Width: 9.2 cm (3.6 in) Part of a series of articles aboutClassical mechanics${\displaystyle {\vec {F}}=m{\vec {a}}}$Second law of motion History Timeline Branches Applied Celestial Continuum Dynamics Kinematics Kinetics Statics Statistical Fundamentals Acceleration Angular momentum Couple D'Alembert's principle Energy kinetic potential Force Frame of reference Inertial frame of reference Impulse Inertia / Moment of inertia Mass Mechanical power Mechanical work Moment Momentum Space Speed Time Torque Velocity Virtual work Formulations Newton's laws of motion Analytical mechanics Lagrangian mechanicsHamiltonian mechanicsRouthian mechanicsHamilton–Jacobi equationAppell's equation of motionKoopman–von Neumann mechanics Core topics Damping (ratio) Displacement Equations of motion Euler's laws of motion Fictitious force Friction Harmonic oscillator Inertial / Non-inertial reference frame Mechanics of planar particle motion Motion (linear) Newton's law of universal gravitation Newton's laws of motion Relative velocity Rigid body dynamics Euler's equations Simple harmonic motion Vibration Rotation Circular motion Rotating reference frame Centripetal force Centrifugal force reactive Coriolis force Pendulum Tangential speed Rotational speed Angular acceleration / displacement / frequency / velocity Scientists Galileo Huygens Newton Kepler Horrocks Halley Euler d'Alembert Clairaut Lagrange Laplace Hamilton Poisson Daniel Bernoulli Johann Bernoulli Cauchy Categories ► Classical mechanics vt Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.[1] An object's mass also determines the strength of its gravitational attraction to other bodies. The basic SI unit of mass is the kilogram (kg). In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force. Contents 1 Phenomena 2 Units of mass 3 Definitions 3.1 Weight vs. mass 3.2 Inertial vs. gravitational mass 3.3 Origin 4 Pre-Newtonian concepts 4.1 Weight as an amount 4.2 Planetary motion 4.3 Galilean free fall 5 Newtonian mass 5.1 Newton's cannonball 5.2 Universal gravitational mass 5.3 Inertial mass 6 Atomic mass 7 In relativity 7.1 Special relativity 7.2 General relativity 8 In quantum physics 8.1 Tachyonic particles and imaginary (complex) mass 8.2 Exotic matter and negative mass 9 See also 10 Notes 11 References 12 External links

Other Languages
Afrikaans: Massa
Alemannisch: Masse (Physik)
አማርኛ: ግዝፈት
العربية: كتلة
aragonés: Masa
অসমীয়া: ভৰ
asturianu: Masa
Avañe'ẽ: Mba'era'ã
تۆرکجه: کوتله
বাংলা: ভর
Bân-lâm-gú: Chit-liōng
башҡортса: Масса
беларуская: Маса
беларуская (тарашкевіца)‎: Маса
भोजपुरी: भार
български: Маса
Boarisch: Massn
bosanski: Masa
brezhoneg: Mas
буряад: Масса
català: Massa
Чӑвашла: Масса
čeština: Hmotnost
chiShona: Huremu
Cymraeg: Màs
eesti: Mass
Ελληνικά: Μάζα
español: Masa
Esperanto: Maso
estremeñu: Massa
euskara: Masa
Fiji Hindi: Mass
français: Masse
Gaeilge: Mais
Gaelg: Glout
galego: Masa

ગુજરાતી: દ્રવ્યમાન

한국어: 질량
հայերեն: Զանգված
हिन्दी: द्रव्यमान
hrvatski: Masa
Ido: Maso
Ilokano: Masa
Bahasa Indonesia: Massa
íslenska: Massi
italiano: Massa (fisica)
עברית: מסה
Jawa: Massa
Kabɩyɛ: Hɩlɩmɩyɛ
ქართული: მასა
қазақша: Масса
Kiswahili: Masi
Kreyòl ayisyen: Mas inèsi
kriyòl gwiyannen: Mas
kurdî: Bariste
Кыргызча: Масса
Latina: Massa
latviešu: Masa
Lëtzebuergesch: Mass (Physik)
lietuvių: Masė
Limburgs: Massa
lingála: Libóndó
Lingua Franca Nova: Masa
lumbaart: Massa
magyar: Tömeg
македонски: Маса (физика)
മലയാളം: പിണ്ഡം
मराठी: वस्तुमान
مصرى: كتله
Bahasa Melayu: Jisim
Mìng-dĕ̤ng-ngṳ̄: Cék-liông
монгол: Масс
မြန်မာဘာသာ: ဒြပ်ထု
नेपाली: पिण्ड

Nordfriisk: Mase
norsk: Masse
norsk nynorsk: Masse
Novial: Mase
occitan: Massa
oʻzbekcha/ўзбекча: Massa
ਪੰਜਾਬੀ: ਪੁੰਜ
پنجابی: وزن
Patois: Mas
ភាសាខ្មែរ: ម៉ាស
Piemontèis: Massa (fìsica)
Plattdüütsch: Masse (Physik)
português: Massa
Ripoarisch: Masse
română: Masă
Runa Simi: Wisnu
русиньскый: Маса
русский: Масса
Scots: Mass
Seeltersk: Masse
shqip: Masa
sicilianu: Massa
සිංහල: ස්කන්ධය
Simple English: Mass
slovenčina: Hmotnosť
slovenščina: Masa
ślůnski: Masa
Soomaaliga: Cuf
کوردی: بارستە
српски / srpski: Маса
srpskohrvatski / српскохрватски: Masa
Sunda: Massa
suomi: Massa
svenska: Massa
Tagalog: Masa
தமிழ்: திணிவு
Taqbaylit: Takura
татарча/tatarça: Massa
తెలుగు: ద్రవ్యరాశి
ไทย: มวล
тоҷикӣ: Масса
Türkçe: Kütle
українська: Маса
اردو: کمیت
vèneto: Masa
Tiếng Việt: Khối lượng

Winaray: Masa

Xitsonga: Vunyingi-swilo
ייִדיש: מאסע