Why does the earth rotate on its axix?

Answer 1

Because of a number of reasons, the main one, our Earth is not a perfect sphere. Secondly, the mass and density of the sun is not absolutely perfect. Hence, the space distortion caused by the Sun is not symetrical, therefore an imperfect gravitational force on the earth mass.

Getting back to the 1st reason, the oval shape of the Earth and the gravitational pull of the sun, and the sun's velocity within the Milky Way, all sum up to cause a spinning mass.

And thirdly, the initial inertial energy during the formation of the solar system was random and, like a curve ball pitcher, the thrust was off-center. The odds of a thrust that was dead-center is astonomical. The odds of missing other large asteroids is also astronomically large.

The only time an object would not spin if the initial thrust was dead center, there were no objects to interfere with its path, the object was absolutely circular and the sun gravitional force was even. Lacking the above, we'll always be spinning.

Then there's the "core is a molten mass locked in a vault" answer. As the gravity of the sun pulls on the earth, combined with the forward momentum of the earth, we establish a revolution of the planet. The fact that the earth has an active seismic body means that our liquid core has gravity act on it. Just like the revolution, the dynamic of forward momentum and solar gravity causes the planet to wobble, or rotate. The fact that is does so at the magnetic poles is due to electron discharge that makes the magnetosphere as well as defines the poles.

Answer 2

the earth formed out of many asteroids colliding together and joining, the last few big ones probably hit us on a similar angle and sent us spinning on our axis, and since there is nothing to slow us down we have been spinning ever since

Answer 3

To not rotate would be very, very strange. You would have to have an angular momentum of zero, when there are infinite other possibilities that all define some angular momentum other than zero.

odds of 1 to infinity are very steep indeed.

Answer 4

centrepical force and gravity acting together