What would happen to tides if Earth stopped rotating?

Answer 1

It would mean that the Earth had stopped rotating.

Even the complete disappearance of the Moon would not stop the tides,

because the Sun has a lot of influence on them too. Even without the

Moon, there would still be substantial tides, as long as Earth continued

to rotate.

(Also note that if the Earth stopped rotating, the disappearance of the tides

would be the least of our problems.)

Just to be clear, the tides will stop when the Earth stops rotating relative to the Moon. It would still have some rotation relative to the stars. The Earth's rotation is actually very slowly slowing down. So, eventually, the Moon should only be visible from one side of the Earth.

Even then there would still be some rotation relative to the Sun. So, if you want to be really "picky" the tides would not stop completely.

This process will take billions of years, so the Sun becoming a red giant

may "spoil" things.

Answer 2

We wouldn't care, because the amount of energy it would take to stop the Earth from spinning would destroy the planet anyway.

Eventually, billions of years from now, IF the Earth and Moon survive the expansion of the Sun into a red giant, the Earth's rotation will slow down and the Earth will become tidally locked like the Moon is. The Earth will spin at the same speed that the Moon orbits, and the Moon will appear to be suspended in the sky. When that happens, there will no longer be any tides.

Yes, but the Earth would still be rotating, very slowly, relative to the distant stars. The estimate I've seen is that the length of the Earth's rotation period then would be about 47 times the length of our present Earth Day. If it were possible for the Earth to stop rotating altogether, there would technically be some tides again, but that's a bit pedantic.

Also, there would still be some very small effects because of the Sun.