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Newton's law of universal gravitation

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Statue of Isaac Newton in the chapel of Trinity College, Cambridge

Newton's universal law of gravitation is a true physical law that describes the attraction between two objects with mass. It is talked about in Isaac Newton's Philosophiae Naturalis Principia Mathematica.[1][2] The law is part of classical mechanics.

The formula is

[math]F_{g} = G \frac{m_1 m_2}{r^2},[/math]

In this equation:

  • "Fg" is the total gravitational force between the two objects.
  • "G" is the gravitational constant.
  • "m1" is the mass of the first object.
  • "m2" is the mass of the second object.
  • "r" is the distance between the centre of object a to the centre of object b.


  1. "Sir Isaac Newton: The Universal Law of Gravitation" (in English). Astronomy 161. Retrieved 2009124.
  2. Cox, Brian; Forshaw, Jeff (2011). The Quantum Universe: Everything That Can Happen Does Happen. Allen Lane. p. 14. ISBN 978-1-846-14432-5 .