Is it empirically proven that there is an actual and not only apparent increase in mass at relative velocity? If that were the case and the moving object was as big as a spacecraft, which of its particles would increase its mass? If the elementary particles that make up the body increase their mass, why does this happen? Especially they are contained in larger groups, in other words they are at rest or their movement and speed does not change with respect to the body that contains them. Quarks, for example, do not change their movement relative to the hadron that contains them. Relative velocity will relate to the body as a whole, not its constituent particles.
And how the mass increases despite the absence of a universal frame of reference, that is, the observer in the moving object can suppose itself as at rest and the other is moving.
The same question and discussion above can be mentioned on the change in length.
The empirical evidence of mass increase lay in the early 1900's experiments of Kaufmann, Bucherer et al. They involved the bending of an electron's path in a magnetic field. However, there was no proof that it was actually mass that increased.
Special relativity accurately reflected the increase. However, velocity is an effect and not a cause as SR claims. The Compton collision between a photon and electron clearly identifies any presumed changes to "mass" is determined solely by the ratio of the mass-equivalent photon to the electron. The mysterious increase in "mass" as per SR is also dispelled by a simple calculation in mechanics, showing it to be an inelastic collision, where the photon's mass-equivalence is added to the electron's mass, less subsequent emission. Further, the difference in mass cannot pertain to inertial frames in relative motion because of the first postulate. It must be a reciprocal arrangement between mechanical and electrodynamic events.
No; it's empirically proven that there isn't. Mass is invariant under global Lorentz transformations.
Dear Mudhafar Jasim, Thanks for your question.
In the Sommerfeld and Dirac approaches of the quantum mechanics, the calculation of the energy using the relativity with variation of the mass, obtain good result. But how are obtained the variations of speed. As underlined by Einstein the law of the Physics must be the same for observations from the nucleus or the electron. As a result variation of speed imply exchange of mass between the both parts of the atom.
In my opinion the increase or decrease of mass according to the relativity that is the mathematics formula correspond to the variations speed resulting of exchanged mass so that the energy of the electron is always the same.
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