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The world spins around because of the way the solar system was formed as a spinning cloud of matter. This then it began to collapse in on itself as it did this the heat at the centre became so great that the sun ignited and pushed out all the matter which then formed the planets, still spinning because of the energy from the explosion as the sun ignited.

Supplement 2 As far as the planets are concerned, they would have had some net rotational momentum, the residual of all the components that made the planet.

This rotational energy cannot be destroyed - it however might be cancelled out by opposite-spin material.

BUT back to the question. The Earth carries the residual net spin from its assembly from space debris.

Answer:

The rotation comes about from the conservation of angular momentum. The formula for angular momentum is:

L=mwr2

  • 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, as the radius of the orbit decreases, then its angular velocity must increase (as the mass is constant). As a consequence the parts of the planet closer to the primary (the Sun) must rotate faster than the parts furthest from the Sun. This causes the spin.

This all relates to the fact that planetary and stellar systems are born from the collapse of dense interstellar clouds. As the clouds collapse even a small rotation is magnified by the contraction. If the clouds were not rotating (matter fell straight to the center of the system) there would be no planets.

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