What If the Earth Stopped Rotating?

Short Answer: You will die.

Explanation: At the equator the surface of the earth and everything on it, is rotating at 465 meters per second. This speed gradually decreases as you go closer to the pole. As soon as earth stops rotating, everything on the earth (except at the pole) would continue moving as it had been.

Your body would fly east at the supersonic speed of 465 meters per second if you’re near the equator.
You can only survive at the poles (for a few seconds).
There will be giant tsunamis and all water will start moving towards the pole.
Half of the earth would be completely exposed to the sun, which would raise the temperature and the other half would freeze.
The speed of wind will be faster than the shock wave of atom bomb. It will instantly start fire all around the planet.
The iron core in the earth’s center would stop too and thus protective magnetic field would no longer be there. The radioactive rays from the sun would enter on earth and kill everything left.
Read: All Interesting Facts About Black Holes and White Holes

And yes, the most important thing: you would gain weight by 0.3%.