# Gravity

From sciforums_encyclopedia

**Gravity** is one of the four fundamental forces of physics.

# Newtonian gravity

Isaac Newton postulated that every piece of matter in the universe attracts every other piece of matter. Two point masses M and m exert attractive forces on each other according to the following force law:

<math>F = \frac{GMm}{r^2}</math>

where <math>F</math> is the gravitational force of attraction, <math>r</math> is the distance between the masses and <math>G</math> is a fundamental constant of nature known as the *Universal Gravitational Constant*.

## History

Gravity was invented by Sir Isaac Newton. Before gravity was invented everything had to be strapped, nailed or glued down. The lack of gravity was a real problem in the southern hemisphere. People kept falling off the globe[1].