What is Newton's law of universal gravitation?
'''Newton's universal law of gravitation''' is a [[physical law]] that describes the attraction between two objects with [[mass]]. [[Isaac Newton|Sir Isaac Newton]] talked about it in his book ''[[Philosophiae Naturalis Principia Mathematica]]''.<ref>{{cite web|title=Sir Isaac Newton: The Universal Law of Gravitation|url=http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html|access-date=2009-01-24|publisher=Astronomy 161|language=en}}</ref><ref>{{cite book|page=[https://archive.org/details/quantumuniversee0000coxb/page/14 14]|title=The Quantum Universe: Everything That Can Happen Does Happen|url=https://archive.org/details/quantumuniversee0000coxb|publisher=Allen Lane|date=2011|first1=Brian|first2=Jeff|last1=Cox|last2=Forshaw|isbn=978-1-846-14432-5}}</ref> The law is part of [[classical mechanics]]. The formula is <math>F_g=Grac{m_1 m_2}{r^2},</math> [[File:NewtonsLawOfUniversalGravitation.svg|right]] In this equation: * <math>F_g</math> is the total gravitational force between the two objects. * <math>G</math> is the [[gravitational constant]]. * <math>m_1</math> is the mass of the first object. * <math>m_2</math> is the mass of the second object. * <math>r</math> is the distance between the centers of the objects. In [[International System of Units|SI units]], <math>F_g</math> is measured in [[Newton (unit)|newton]]s (N), <math>m_1</math> and <math>m_2</math> in [[kilogram]]s (kg), <math>r</math> in [[meter]]s (m), and the constant <math>G</math> is approximately equal to {{val|6.674|e=-11|u=N m<sup>2</sup> kg<sup>−2</sup>}}.<ref>{{cite journal|first1=Peter J.|last1=Mohr|first2=David B.|last2=Newell|first3=Barry N.|last3=Taylor|title=CODATA recommended values of the fundamental physical constants: 2014|journal=Reviews of Modern Physics|volume=88|page=035009|doi=10.1103/RevModPhys.88.035009|issue=3|date=July–September 2016|arxiv=1507.07956|bibcode=2016RvMP...88c5009M|s2cid=1115862}}</ref> == References == {{reflist}} {{physics-stub}} [[Category:Mechanical engineering]]