Why does the earth revolves* around the sun?

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Why does the earth revolves* around the sun?

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Answer 1 · 2016-01-28T15:25:23

If it did not it will fall in to the sun.

Explanation:

There are two balancing forces acting on earth when it revolves around the sun.

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Gravitational force of attraction.
Law of Universal Gravity states that every body in this universe attracts every other body with a force which is called force of gravity. The force

$F_{G} = G \frac{M_{1} . M_{2}}{r^{2}}$ $F_G =G (M_1.M_2)/r^2$

Where $M_{1} and M_{2}$ $M_1 and M_2$ are mass of two interacting bodies, $r$ $r$ is the distance between the two and $G$ $G$ a constant.

It has the value $6.67408 \times 10^{- 11} m^{3} k g^{- 1} s^{- 2}$ $6.67408 xx 10^-11 m^3 kg^-1 s^-2$
In our case, one is the sun and other earth.

Centrifugal force.
Centrifugal force is a 'fictitious' force that appears to act on all rotating objects and is directed away from the axis of rotation.
It is given by the expression

$F_{c e n t r i f u g a l} = m r ω^{2}$ $F_(centri fugal)=mromega^2$

where $m$ $m$ is the mass of rotating object, $r$ $r$ the radius of circle of rotation and $ω$ $omega$ its angular velocity.

These two forces balance each other and keep the sun-earth system in equilibrium.

-.-.-.-.-.-.-.-.-.-.-.-.
*in the question 'revolves' is preferred word as earth 'rotates' around its axis.

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Why does the earth revolves* around the sun?

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