Are you a Flat Earth Crazy or a Round Earth Rational.
Centripetal, Centrifugal, same thing really, I don't want to get petty!
cetripetal != centrifugal. The centrifugal force is a true pseudoforce - Its what we think to "feel" when we're being pushed into our seats when e.g. driving a turn, it feels like something pushes us to the side, however really the only actual force that exists is the cetripetal force, that pushes us into the turn. I.e. we think we fly to the right side of the car, however really the car is turning left and taking us with it, making us feel this.
And no, if the earth was flat, it better not be rotating. That would be.. well, probably quite funny.