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The '''inverse square law''' predicts the intensity of a field at a given distance from a point source.In general, it applies to 'force-fields' forces such as gravitational, magnetic and electrical. This law states that force gets weaker as you move away from its source by a factor of four (i.e. two squared) when the distance from source is doubled.<ref name="WhomadeGod">{{cite book|author=Edgar Anrews|title= Who made God? Searching for a theory of everything.|publisher= EP Books|location= Carlisle, PA, USA|year= 2010|pages=149|isbn=978-0-85234-707-2|url=https://books.google.com/books?id=p5LkPwAACAAJ&dq=Andrews+Who+made&hl=en&sa=X&ei=ahTXUYX9A4qF4gTLoYGgCQ&ved=0CCsQ6AEwAA|quote= }}</ref>

Take a [[point source]] that is propagating something ([[light]], [[sound]], [[gravity]], [[electric field]], etc..) out. This

The inverse square law can be derived by looking at the surface area of a [[sphere]] of radius ''<math>r''</math>. The surface area of a sphere is <math>4&\pi;r<sup>^2</supmath>. As the radius increases, the surface area of the sphere goes up with the square of the radius and the intensity of the phenomena will be inversely proportional to the [[surface area]].

With gravity, the inverse square law can be seen in Gmas: <submath>1</sub>m₂ / F= \frac{Gm_1m_2}{r<sup>^2}</supmath>.

== Refrences References ==

[[Category:Laws of Physics]][[Category: Physics]]