Question

what if gravitational force did not exist

Answer 1

we will be flying on the earth
moon won't have gravity

Answer 2

If only Earth just stopped generating gravitational field, it would disintegrate and then, in time, fall into Moon, making another, slightly bigger planet.

If the material of Earth also stopped being influenced by gravity, is would just fly apart. In both cases disintegration would be violent, because pressure deep in Earth’s innards is tremendous, and only gravity counteracts it.

But if there were no gravity at all, there would be no Earth, no Sun. solar system, other stars - nothing but amorphous cloud of hydrogen and an odd helium atom. Dead, cold, featureless Universe.