Editing Newton's laws of motion (section)

===Candidates for additional laws===
Various sources have proposed elevating other ideas used in classical mechanics to the status of Newton's laws. For example, in Newtonian mechanics, the total mass of a body made by bringing together two smaller bodies is the sum of their individual masses. [[Frank Wilczek]] has suggested calling attention to this assumption by designating it "Newton's Zeroth Law".<ref>{{cite web|first=Frank |last=Wilczek |author-link=Frank Wilczek |title=The Origin of Mass |website=MIT Physics Annual 2003 |url=https://physics.mit.edu/wp-content/uploads/2021/01/physicsatmit_03_wilczek_originofmass.pdf |year=2003 |access-date=2022-01-13}}</ref> Another candidate for a "zeroth law" is the fact that at any instant, a body reacts to the forces applied to it at that instant.<ref>{{Cite journal |last1=Scherr |first1=Rachel E.|author1-link=Rachel Scherr |last2=Redish |first2=Edward F. |date=2005-01-01 |title=Newton's Zeroth Law: Learning from Listening to Our Students |url=https://aapt.scitation.org/doi/10.1119/1.1845990 |journal=[[The Physics Teacher]] |volume=43 |issue=1 |pages=41–45 |doi=10.1119/1.1845990 |bibcode=2005PhTea..43...41S |issn=0031-921X}}</ref> Likewise, the idea that forces add like vectors (or in other words obey the [[superposition principle]]), and the idea that forces change the energy of a body, have both been described as a "fourth law".{{refn|group=note|For the former, see Greiner,<ref>{{cite book|last1=Greiner|first1=Walter|title=Classical Mechanics: Point Particles and Relativity|url=https://archive.org/details/springer_10.1007-b97649|date=2003|page=135|publisher=Springer|location=New York|isbn=978-0-387-21851-9}}</ref> or Wachter and Hoeber.<ref>{{cite book|last1=Wachter|first1=Armin|last2=Hoeber|first2=Henning|title=Compendium of theoretical physics|date=2006|page=6|publisher=Springer|location=New York|isbn=978-0-387-25799-0}}</ref> For the latter, see Tait<ref>{{Cite book|last=Tait|first=Peter Guthrie|author-link=Peter Guthrie Tait|date=1889|chapter=Mechanics |title=Encyclopædia Britannica |title-link=Encyclopædia Britannica |edition=9th |pages=715–716 |volume=15 |chapter-url=https://en.wikisource.org/wiki/Page:Encyclop%C3%A6dia_Britannica,_Ninth_Edition,_v._15.djvu/747}}</ref> and Heaviside.<ref>{{Cite journal|last=Heaviside|first=Oliver|author-link=Oliver Heaviside|date=August 1905|title=The Transverse Momentum of an Electron|journal=[[Nature (journal)|Nature]]|language=en|volume=72|issue=1870|pages=429|doi=10.1038/072429a0|bibcode=1905Natur..72Q.429H |s2cid=4016382 |issn=0028-0836|doi-access=free}}</ref> }}

Moreover, some texts organize the basic ideas of Newtonian mechanics into different postulates, other than the three laws as commonly phrased, with the goal of being more clear about what is empirically observed and what is true by definition.<ref name=":2" />{{Rp|page=9}}<ref name="Eisenbud"/>