🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsTiếng ViệtРусскийالعربية日本語EntityQ4393075· pop 21· linked from 205 articlesrelativistic mechanicstheory of motion and forces for objects close to the speed of lightAvailable in 20 languagesFrançais日本語РусскийPortuguêsItalianoالعربيةAzerbaijaniBanglaBelarusianConnectionsNewton's laws of motionEntityfour-vectorEntityCategoriesTheory of relativity