Why does the earth turn around its own axis?

Question

A simple explanation, please!

Answer 1

It retains the spin (angular momentum) of all the particles which coalesced to form it. These particles came from the protosolar nebula, which was orbiting in a particular direction around the Sun. All planets orbit in this direction, and most planets rotate in it. Those that don't (Venus and Uranus) were probably struck by large asteroids that switched their spins.

Like matter and energy, angular momentum is conserved. It can neither be created nor destroyed.

Answer 2

There is no force that causes the planets to rotate. Most of the rotation comes about from the conservation of angular momentum. Angular momentum is given by L=m*w*r2 where m is the mass, w is the angular velocity in radians per second, and r is the radius of the circular motion. Due to conservation of angular momentum, if the radius of the orbit decreases, then its angular velocity must increase (as the mass is constant).

All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place. In fact, this is one of the barriers in star formation: there is excess angular momentum and there has to be a way of losing angular momentum before you can form a star.

Anyway, the bottom line is that stars like the Sun spin from the original angular momentum that was there in the solar nebula from which it formed. Not only that, all orbital motion of the planets (including the spin) is due to this orginal angular momentum.

Answer 3

It is believed that the rotation and revolution of all the planets in our solar system must have originated at the time they formed(or solidfied) from a revolving disk of hot gases known as the solar nebula,the sun being at its centre.
The following facts may be taken into consideration in arriving at the above decision.
(1)Most of the planets rotate on their axes from west to east(2)They revolve around the sun from west to east(3)The sun itself rotates about its axis from west to east as viewed from the north celestial pole in space.(4)Planetary orbits lie at regular intervals from the sun(approximately double the distance from the sun as its next inward neighbour) and (5)Satellites of planets tend to imitate the planetry system with a few exceptions.
Rotation in the same sense as the revolution should have been the natural dynamical motion with least resistance.
The above facts confirm that the rotation of the planets(and hence the earth) around thier axes relates to the origin of solar system itself.

Answer 4

Whose axis do you want it to rotate around

Answer 5

y dont u spare ur axis so that it can rotate on urs

Answer 6

because of the moon.