2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55024There are known problems of Lorentz-Dirac equation for moving with acceleration charged particle in classical electrodynamics. The model of extended in one dimension particle is proposed and shown that electromagnetic self-interaction can lead (with appropriate choice of retarded and advanced interactions) to zero change in particle momentum. The hypothesis is formulated: all relativistic internal forces of various nature can give zero change in particle momentum18 pages, LATEXHigh Energy Physics - Theorytext