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- Mass abstract "In physics, mass (from Greek μᾶζα "barley cake, lump [of dough]") is a property of a physical body which determines the body's resistance to being accelerated by a force and the strength of its mutual gravitational attraction with other bodies. The SI unit of mass is the kilogram (kg). As mass is difficult to measure directly, usually balances or scales are used to measure the weight of an object, and the weight is used to calculate the object's mass. For everyday objects and energies well-described by Newtonian physics, mass describes the amount of matter in an object. However, at very high speeds or for subatomic particles, special relativity shows that energy is an additional source of mass. Thus, any stationary body having mass has an equivalent amount of energy, and all forms of energy resist acceleration by a force and have gravitational attraction.There are several distinct phenomena which can be used to measure mass. Although some theorists have speculated some of these phenomena could be independent of each other, current experiments have found no difference among any of the ways used to measure mass:Inertial mass measures an object's resistance to changes in velocity m=F/a. (the object's acceleration)Active gravitational mass measures the gravitational force exerted by an object.Passive gravitational mass measures the gravitational force experienced by an object in a known gravitational field.Mass-Energy measures the total amount of energy contained within a body, using E=mc²The mass of an object determines its acceleration in the presence of an applied force. This phenomenon is called inertia. According to Newton's second law of motion, if a body of fixed mass m is subjected to a single force F, its acceleration a is given by F/m. A body's mass also determines the degree to which it generates or is affected by a gravitational field. If a first body of mass mA is placed at a distance r (center of mass to center of mass) from a second body of mass mB, each body experiences an attractive force Fg = GmAmB/r2, where G = 6.67×10−11 N kg−2m2 is the "universal gravitational constant". This is sometimes referred to as gravitational mass.Repeated experiments since the 17th century have demonstrated that inertial and gravitational mass are identical; since 1915, this observation has been entailed a priori in the equivalence principle of general relativity.".
- Mass thumbnail SI_base_unit.svg?width=300.
- Mass wikiPageExternalLink mass.html.
- Mass wikiPageExternalLink equivME.
- Mass wikiPageExternalLink n3138.pdf.
- Mass wikiPageID "19048".
- Mass wikiPageRevisionID "606201066".
- Mass date "January 2014".
- Mass hasPhotoCollection Mass.
- Mass reason "'mass in kilograms' does not specify a experimental method. What's the distinction between the methods?".
- Mass subject Category:Classical_mechanics.
- Mass subject Category:Concepts_in_physics.
- Mass subject Category:Mass.
- Mass subject Category:State_functions.
- Mass comment "In physics, mass (from Greek μᾶζα "barley cake, lump [of dough]") is a property of a physical body which determines the body's resistance to being accelerated by a force and the strength of its mutual gravitational attraction with other bodies. The SI unit of mass is the kilogram (kg). As mass is difficult to measure directly, usually balances or scales are used to measure the weight of an object, and the weight is used to calculate the object's mass.".
- Mass label "Masa (fizyka)".
- Mass label "Masa".
- Mass label "Mass".
- Mass label "Massa (fisica)".
- Mass label "Massa (natuurkunde)".
- Mass label "Massa".
- Mass label "Masse (Physik)".
- Mass label "Masse".
- Mass label "Масса".
- Mass label "كتلة".
- Mass label "質量".
- Mass label "质量".
- Mass sameAs Hmotnost.
- Mass sameAs Masse_(Physik).
- Mass sameAs Μάζα.
- Mass sameAs Masa.
- Mass sameAs Masa.
- Mass sameAs Masse.
- Mass sameAs Massa.
- Mass sameAs Massa_(fisica).
- Mass sameAs 質量.
- Mass sameAs 질량.
- Mass sameAs Massa_(natuurkunde).
- Mass sameAs Masa_(fizyka).
- Mass sameAs Massa.
- Mass sameAs m.04t9l.
- Mass sameAs Q11423.
- Mass sameAs Q11423.
- Mass wasDerivedFrom Mass?oldid=606201066.
- Mass depiction SI_base_unit.svg.
- Mass isPrimaryTopicOf Mass.
