Friday, December 28, 2012

Universal Forces - Gravitational Force

Universal forces are some forces, which will be present anywhere in this whole universe. The universe comprises of everything including the Earth, Sun and all the smallest particles like proton, neutron. It include all the matter that  is known to us. Various universal forces known to us are Gravitational force, Electromagnetic force, Nuclear Force,
So I am going to discuss here one very important force,
(1) Gravitation Force :    Gravitation force is the force of attraction between any two masses. It is present between any two masses in this universe. If you want to know the reason why Earth revolve around the Sun the it is the answer.
It is the gravitational force that has bound together the Earth and the Sun and makes the earth stay in its path. There are two forces acting on the earth instantly and  are opposite in direction and equal in magnitude. The forces are
(1) Gravitational force and the other is (2) Centrifugal force
Gravitational force pulls the Earth toward its center of rotation and the Centrifugal force tries to move it away from the center of rotation. The both are equal in magnitude and cancels each other, making the earth stay on its path of rotation. Gravitational force is present between any two masses in this universe but it is of small magnitude in the small bodies.
Numerically one can find the magnitude of the force of Gravitation between two bodies, by using the Newton's formula for the Gravitation,
It says that,
Force of gravitation between two bodies of Mass M1 and Mass M2 at a distance r units apart is,
(1) directly proportional to the product of the masses
(2) Inversely proportional to the square of the distance between the two.

Or  F = (G*M1*M2)/r2

Here G is called as the Gravitational constant.
F is the magnitude of the force between the two bodies.
If Newton was not sitting below the apple tree, then no body knows who could have discovered the force of Gravitation.

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