Gravity

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].