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# Topic: Relativistic Mass

###### In the News (Tue 22 May 18)

 Mass in special relativity Summary In particular, the relativistic mass increases with observed speed while the rest mass is an invariant property of an object: it does not change with a change of reference system. In the earlier years of relativity, relativistic mass was sometimes taken to be the "correct" notion of mass, and the invariant mass was referred to as the rest mass. For other reference frames, and other single observers, mass and energy are separately conserved in reactions, but as noted the value of relativistic mass and total energy in systems varies, as measured by different observers, even though the value is conserved in reactions, as seen by each observer. www.bookrags.com /Mass_in_special_relativity   (2261 words)

 Relativistic mass - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-09) In particular, the relativistic mass increases with velocity while the rest mass is an intrinsic property of an object. In the earlier years of relativity, relativistic mass was taken to be the "correct" notion of mass, and the invariant mass was referred to as the rest mass. In popular science and basic relativity courses, however, the relativistic mass is usually still presented, due to its conceptual simplicity and the fact that certain equations from nonrelativistic mechanics retain their form (namely, Newton's second law). en.wikipedia.org /wiki/Relativistic_mass   (674 words)

 Does mass change with velocity? The invariant mass of a particle is independent of its velocity v, whereas relativistic mass increases with velocity and tends to infinity as the velocity approaches the speed of light c. Although relativistic mass is not wrong it often leads to confusion and is less useful in advanced applications such as quantum field theory and general relativity. Invariant mass proves to be more fundamental in Minkowski's geometric approach to special relativity and relativistic mass is of no use at all in general relativity. www.weburbia.demon.co.uk /physics/mass.html   (1785 words)

 [No title] There is a boxed in limit, where the moving mass (bumped in value in special relativity) assumes a value equivalent to the mass of a fl hole, when the original rest mass is expanded by the effect of special relativity, in direct accord with the mass's radius contracted by the effect of special relativity. The maximum velocity attainable by a visible moving mass, is the speed of light reduced by the proportionate effect of the gravitational relativistic effect in the mass being accelerated. The problem is that such a conjecture (relativistic augment- ation in mass) is hard to prove, since it is not possible to actually separate a given mass from its gravity and so observe any change in the apparent mass, when the mass is compared with vrs without the relativity of the gravity. www.textfiles.com /occult/relative.1   (4561 words)

 Fundamental Nature of Relativistic Mass and Magnetic Field In the case of the proton, the mass of the electric field is accumulated until the proton mass is reached. Therefore, the fundamental phenomenon responsible for the increase of relativistic mass with velocity is the magnetic vortices of the electric field, as calculated with the Biot-Savart equation. Since it is observed that the mass of an electron, combined with the proton, gives the mass of the hydrogen atom (or the mass of the neutron), we must conclude that both the electron and the proton exist simultaneously in the hydrogen atom (and in the neutron). www.newtonphysics.on.ca /magnetic/mass.html   (12632 words)

 Does light have mass? Relativistic mass is a measure of the energy E of a particle, which changes with velocity. In this case mass is not conserved and the mass of an object is not the sum of the masses of its parts. Relativistic mass is equivalent to energy, which is why relativistic mass is not a commonly used term nowadays. www.desy.de /pub/www/projects/Physics/Relativity/SR/light_mass.html   (1116 words)

 Relativistic mass - Definition, explanation The rest mass, or invariant mass, is an observer independent quantity, while the relativistic mass, or apparent mass depends on one's frame of reference. In the earlier years of relativity, it was the relativistic mass that was taken to be the "correct" notion of mass, and the invariant mass was referred to as the rest mass. The primary reason that most physicists chose to abandon relativistic mass in favor of the rest mass is that rest mass is a Lorentz invariant quantity — it is the same in every reference frame. www.calsky.com /lexikon/en/txt/r/re/relativistic_mass.php   (1584 words)

 PhysOrgForum Science, Physics and Technology Discussion Forums -> The relativistic mass of light? Mass! So it can be convenient, in the case of high-speed massy objects, to think of the faster one as being heavier, because it takes more force to accelerate it by a given amount than for a slower object. If, in all cases, the relativistic mass of a massy object interacts in the same fashion as its rest mass, then maybe it could be just as valid to consider the relativistic mass as being "true mass". Anyway, if you think of "relativistic mass" as arising from a change in momentum, rather than as a side effect of moving, then suddenly it is very easy to think of it as "the same" between light and massy objects. forum.physorg.com /index.php?showtopic=2229   (2925 words)

 Relativistic mass Although relativistic mass is not wrong it often leads to confusion and is less useful in advanced applications such as quantum field theory and general relativity. At zero velocity the relativistic mass is equal to the invariant mass. Relativistic mass became common usage in the relativity text books of the early 1920's written by Pauli, Eddington and Born. www2.corepower.com:8080 /~relfaq/mass.html   (1785 words)

 Reference.com/Encyclopedia/Mass in special relativity In particular, the relativistic mass increases with observed speed while the invariant mass is an invariant property of an object: it does not change with a change of reference system. Note that the invariant mass of a closed system is also independent of observer or inertial frame, and is a constant, conserved quantity for closed systems and single observers, even during chemical and nuclear reactions. Relativistic mass is equivalent to relativistic energy, so this type of mass is always conserved in all processes, because total energy is conserved. www.reference.com /browse/wiki/Relativistic_mass   (2823 words)

 [3.0] Relativistic Mass & Energy   (Site not responding. Last check: 2007-10-09) For example, Alice's starship accelerating towards the speed of light undergoes a relativistic mass increase as seen by Bob, with the mass being produced by the energy the starship is expending to accelerate. After impact, the combined mass remains in the frame of reference of the Earth, and so is moving away from the starship at 50% of the speed of light. This increase in mass is due to the energy pumped into the object to accelerate it, and leads to the mass-energy equivalence E = M * C^2. www.vectorsite.net /tprel_3.html   (3517 words)

 R Examples are relativistic quantum field theories as theories based on special relativity, or the relativistic perihelion shift as a consequence of general relativity. The relativistic mass of an object is defined in the same way, and the value an observer measures for this relativistic mass increases as an object moves faster and faster relative to that observer. The rest mass is the inertial mass of an object, measured by an observer relative to whom the object is at rest. www.einstein-online.info /en/navMeta/dictionary/r/index.html   (1108 words)

 Relativistic mass The invariant mass of a particle is independent of its speed v, whereas relativistic mass increases with speed and tends to infinity as the speed approaches that of light, c. Although the idea of relativistic mass is not wrong, it often leads to confusion, and is less useful in advanced applications such as quantum field theory and general relativity. The phrase "The rest mass of a photon is zero" might sound nonsensical because the photon can never be at rest; but this is just a side effect of the terminology, since by making this statement, we can bring photons into the same mathematical formalism as the everyday particles that do have rest mass. www.desy.de /pub/www/projects/Physics/Relativity/SR/mass.html   (2272 words)

 Physics Today December 2000 His discussion of relativistic mass centers on the distinctions between relativistic mass, rest mass, and classical (Newtonian) mass, and the debate over their relationships. In the context of inertial mass, Jammer considers the structuralist approach to theories and the manner in which structuralism distinguishes between theoretical concepts and observational concepts. He considers the notion of incommensurability in the context of competing views on the relationship between relativistic and classical mass, and he touches on the nature of scientific explanation in the context of the claim that general relativity explains the equality between inertial mass and (passive) gravitational mass. www.physicstoday.org /pt/vol-53/iss-12/p67b.html   (796 words)

 The Equivalence of Mass and Energy However, as we have seen, this is not the case in relativistic physics, because the energy absorbed by the block of gold contributes to an increase in its rest-mass. Finally, by saying that mass and energy are the same, these thinkers are suggesting that the denotation of the terms "mass" and "energy" is the same, though they recognize that the connotation of these terms is clearly different. However, in relativistic physics, the qualitative distinction between matter and fields is lost because of the equivalence of mass and energy. plato.stanford.edu /entries/equivME   (5138 words)

 sciforums.com - Relativistic Mass vs. Rest Mass You have an infinite number of distinct relativistic rest masses, relative to an infinite number of objects moving at various speeds relative to you. If gravitational pull increased when relativistic mass increased, some of your relativistic rest masses would warrant you being a fl hole, which I’m assuming you’re not. Relative to the box, the ball has a speed of 0.866 c, giving it a relativistic mass of 2m. www.sciforums.com /showthread.php?t=34014   (1626 words)

 Relativistic Momentum which is the ordinary definition of momentum with the mass replaced by the relativistic mass. It is typical in high energy physics, where relativistic quantities are encountered, to make use of the Einstein relationship to relate mass and momentum to energy. Note that the m with the zero subscript is the rest mass, and that m without a subscript is the effective relativistic mass. hyperphysics.phy-astr.gsu.edu /hbase/relativ/relmom.html   (242 words)

 sciforums.com - Relativistic gravitational mass invariance of receeding bodies Were collapse into a fl hole simply a function of relativistic mass, then from the cosmic ray's frame, the Sun would be more than massive enough. My belief is the same as yours in that if we were to consider relativistic mass, then funny things would happen like you highlighted, but that does not mean that it is not true. If however you increase the mass of the sun by a factor of x, then the gravitational attraction of 270/x m/s^2 becomes 270 m/s^2 again and all is well. www.sciforums.com /printthread.php?t=20679   (884 words)

 relativistic mass - Bad Astronomy and Universe Today Forum The relativistic mass does increase, but this is a purely inertial mass measure and not a gravitational mass measure. This effect is also reciprocal: an occupant of B would see the same thing happen in A. Each might by extrapolation deduce that the mass of the total system of the other had increased to the point where it ought, by the gravity field it creates, to put a strain on the construction. On the other point, how two bodies travelling at uniform near-light speeds could pass each other and measure each other's mass as near infinite but their own as no more than their rest mass, with no apparent gravitational effects, I am still in the dark, but so it seems to me is everyone else. www.bautforum.com /showthread.php?t=14166   (2550 words)

 FrostCloud Forums - The Higgs field and Relativistic Mass But since it is traveling at relativistic speeds its life is prolonged to a gamma factor of 7.1 at.99c allowing it to trvel 16 mircoseconds or 4800 meters deep into the atmosphere. The mass of an object in all frames is considered to be the mass as measured by an observer at rest with respect to the object.’ As Equation 37.29 shows, the relativistic generalization of Newton’s second law is not F = (relativistic mass)(acceleration), and we will show in Section 37.8 that the relativistic kinetic energy of a particle is not K = ½ relativistic mass v squared. www.frostcloud.com /forum/showthread.php?t=4448   (2945 words)

 Time dilation/length contraction Even though circumstances like that described at the Cambridge accelerator are conveniently described by assuming an increasing mass, that is not the only way to describe these experiments, and there are problems with the concept of variable relativistic mass. Upon being introduced to special relativity for the first time, it is easier to contemplate concepts like the speed of light as the speed limit of the universe by envisioning the mass as increasing to infinity at velocity c. However, when one has become familiar with the concepts of relativistic momentum and relativistic energy, there is no real need for the variable mass concept. hyperphysics.phy-astr.gsu.edu /hbase/relativ/tdil.html   (431 words)

 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: 2007-10-09) A relativistic particle is a particle moving with a speed close to the speed of light, such that effects of special relativity are important for the description of its behavior. (This condition implies that their speed is close to the speed of light.) Such relativistic particles are generated in particle accelerators, and are naturally occurring in cosmic radiation. In astrophysics, jets of relativistic plasma are produced by the centers of active galaxies and quasars. www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=relativistic   (152 words)

 Relativistic Energy and Mass This has one significant effect on what the object is capable of doing; however, as Einstein once said, "It is not good to introduce the concept of the mass of a moving body." Therefore relativistic mass is not often used, simply the rest mass is calculated. Right along with time, distance and mass, the kinetic energy of an object needs to be reevaluated for high speeds. This equation not only says that mass and energy are equivalent to each other with the speed of light as a conversion factor, but that energy and mass are interchangeable between each other. ffden-2.phys.uaf.edu /212_fall2003.web.dir/Eddie_Trochim/Energymass.htm   (476 words)

 Relativistic Mass Increase of a Bullet - THR This may be one reason why physicists working in GR use the definition of mass as the length of the four-momentum vector, which is velocity-invariant. FWIW, (remebering from Modern Physics), as an object increases is velocity relative to a frame of rest, it is it's momentum (for purposes of calculations) not nessicarily it's mass that increases. Also, regarding shooting east/west, the same thing holds, the bullets mass increases when measured from the earth's surface, which is stationary compared to the bullet. www.thehighroad.org /showthread.php?t=108395   (1764 words)

 Relativistic Mass   (Site not responding. Last check: 2007-10-09) Jammer, M.: Concepts of Mass in Contemporary Physics and Philosophy.... Relativistic mass equation - definition of Relativistic mass equation by the Fre... Relativistic Calculation of Specific Mass Shifts for Ar+, N i, Kr+,... www.scienceoxygen.com /phys/221.html   (214 words)

 The Open Door Web Site : IB Physics : Relativity : Relativistic Mass The mass of a body measured by an observer at rest relative to the body is called (not surprisingly) the rest mass of the body. The mass (sometimes called the relativistic mass) of the body measured by other observers depends on the velocity of the observer relative to the body. The S.I. unit for mass is the kg and for energy, the Joule. www.saburchill.com /physics/chapters/0093.html   (636 words)

 Re: Relativistic Mass In an article by Rinlder and Denur in the American Journal of Physics the authors never uses the term 'relativistic mass.' They only use the term 'mass' to mean 'relativistic mass.' When he uses 'm' in 'delta m' it refers to 'relativistic mass.' When he refers to mass density it's 'relativistic mass density' etc. etc. "Yet we know from general theory that the mass of any isolated system transforms like that of a particle, i.e., it 'increases' by a gamma factor when moving through the lab." However Rindler and Denur do make it clear that mass and energy are the same thing (in their opinion). Consequently, the energy (mass!) of the box appears to be 'decreased' by a factor of gamma." waite and bilge will now claim this article doesn't exist or that the authors don't know relativity etc. etc. www.usenet.com /newsgroups/sci.physics/msg20555.html   (427 words)

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