In space, there is not even air to push against and slow down the Earth's spin.
The motion of the side of the Earth facing the moon is not balanced perfectly by gravity, and neither is the side of Earth facing away from the moon.As the Earth spins, these bulges move across the Earth's surface like a wave, pushing against the Earth's spin.The only thing that could stop the Earth's spin would be if another planet crashed into it.Even if this happened, it is more likely that it would change the way Earth spins, not stop it altogether.
If the Earth stopped spinning, you wouldn't suddenly be launched off into space.If Earth were to stop spinning but continue to orbit the sun, a "day" would last half a year, and so would the night.
The spinning motion of the Earth turns this molten iron into a magnet and gives the Earth a magnetic field.
If the Earth didn't spin, the night sky would always show the same constellations of stars, because you would always be looking out into space in the same direction!