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# Newton's law of universal gravitation

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**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:

- "F
_{g}" is the total gravitational force between the two objects. - "G" is the gravitational constant.
- "m
_{1}" is the mass of the first object. - "m
_{2}" is the mass of the second object. - "r" is the distance between the centre of object a to the centre of object b.

## References

- ↑ "Sir Isaac Newton: The Universal Law of Gravitation" (in English). Astronomy 161. http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html. Retrieved 2009124.
- ↑ Cox, Brian; Forshaw, Jeff (2011).
*The Quantum Universe: Everything That Can Happen Does Happen*. Allen Lane. p. 14. .