Authors: Guido F. Nelissen
Since all macroscopic matter is made of extremely small particles (electrons, protons, neutrons), all macroscopic bodies are in reality multi-particle systems that are built up from an extremely large number of particles. The present physics defines the linear momentum of such a multi-particle system as the mathematical product of its total mass times the velocity of its center of mass, and its conservation is explained as a consequence of Newton’s first law of motion. In this paper the author reveals the physical nature of the velocity of a particle system, as the congruent translational velocity with which all the particles of the particle system move in unison, that is with exactly the same speed in exactly the same direction. This allows him to demonstrate that the ‘linear momentum’ of a moving particle system is a mathematical expression of its total amount of congruent translational velocity. This leads to the conclusion that the conservation of linear momentum of a mass particle system is a mathematical expression of the physical fact that a particle system cannot change its congruent velocity by its own.
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