EQUILIBRIUM THEORY
By: TheCros
Equilibrium - when no part of an object is accelerating. Net force = 0 & Net torque = 0.

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**http://startswithabang.com/wp-content/uploads/2008/08/composite_earth1_red.gif**
Tides revolve around two theories, the equilibrium theory and the dynamic theory. The equilibrium theory involves the laws of physics and the dynamic theory involves tides as they occur in the real work, fitted to landmasses, geometry of the ocean basins, and Earth's rotation.

The equilibrium tidal theory draws in a water-covered planet and its moon orbiting the sun. Earth's gravitational force secures the Moon in its orbit. Meanwhile, a centripital force pulls the Moon away from Earth attempting to launch it into space.

Earth and the Moon rotate around common center of mass of their orbital system which is held in orbit by the Sun's gravitational attraction while centripital force pulls the center of mass away from the Sun. The centripital and the gravitational forces must attain uphold equilibrium to hold the Earth's and Moon's system in orbit(Tides).


Tides. <**http://www.waterencyclopedia.com/St-Ts/Tides.html**>. Feb 23 2009.