Scintifically what would happen if the earth stops rotating

Scientifically the frequency of the rotation of the earth generates two types of forces. One is the force working from out side towards the inside "force field" that attract all objects towards itself. And the other is the force working from the inside towards the outside "electromagnetic wave". Wave that carries information about earth such as its temperature, its constituents and so on.

So if you are watching the earth from outside, you will notice that, as the earth looses its rotation, it will first loose it balance or stable axis and starts to wobble, like a spinning top loosing its spin. The wobble will come with vibrations that will trigger catastrophic destruction of unimaginable scale.

When it finally stops, it will loose most if not all of its force field. Its gravitational force might be too weak to attract the usual object into itself. That will cause it to loosing its properties as a system, the moon is the first to drift away. As it looses its own ability to attract, its inertia will be greater then its attractions with the sun, reducing its orbital curve around the sun and might even loose it position in the solar system.

Stopping the earth's rotation is a deadliest and disastrous way of stopping the earth from being a system or from being in the solar system.

But any way the earth will still continue to drift, probably into the outer space, like a helplessly giant asteroid. Who knows, it might find another suitable star where it could start rotating again.

The side facing the Sun would get hotter and the other side colder. Then eventually all the plants on the dark side would die off. It wouldn't be possible for the Earth to stop rotating completely. It would have to be something like becoming tidally locked with the Sun. Just like the Moon is tidally locked with the Earth. People don't "fly off" the Moon and it doesn't "shatter" either.