:U [[Inercijalni sistem referencije|inercijalnom referentnom okviru]] objekt ostaje u mirovanju ili se nastavlja kretati konstantnom [[Brzina|brzinom]], osim ako na njega ne deluje [[force|sila]].
:U [[Inercijalni sistem referencije|inercijalnom referentnom okviru]] objekt ostaje u mirovanju ili se nastavlja kretati konstantnom [[Brzina|brzinom]], osim ako na njega ne deluje [[force|sila]].<ref name=first-law-shaums>{{Cite book| last = Browne| first =Michael E.| title =Schaum's outline of theory and problems of physics for engineering and science| publisher = McGraw-Hill Companies| date =July 1999| format =Series: Schaum's Outline Series| page =[https://archive.org/details/schaumsoutlineof00brow/page/58 58]| url =https://archive.org/details/schaumsoutlineof00brow| url-access = registration| isbn =978-0-07-008498-8}}</ref><ref name=first-law-dmmy>{{Cite book| last = Holzner| first = Steven | title =Physics for Dummies| publisher =Wiley, John & Sons, Incorporated| date =December 2005| page =[https://archive.org/details/physicsfordummie00holz/page/64 64]| url =https://archive.org/details/physicsfordummie00holz| url-access = registration| isbn =978-0-7645-5433-9| bibcode = 2005pfd..book.....H }}</ref>
;Drugi zakon
Red 69:
Latinski tekst trećeg Newtonovog zakona glasi:
* ''Actioni contrariam semper et æqualem esse reactionem: sive corporum duorum actiones in se mutuo semper esse æquales et in partes contrarias dirigi''.<ref name=Principia>[http://ia310114.us.archive.org/2/items/newtonspmathema00newtrich/newtonspmathema00newtrich.pdf ''Principia'', Andrew Motte Translation]</ref>
