if the earth is rotating as Tom suggests, then there is no possibility for life on th outer surfaces. centripetal force=M*V^2/R. V being tangential velocity. This means that the centripetal force needed to remain stationary on earth would be SIGNIFICANT. for ANY model witha 24 hour day and a reasonably sized earth, the equator (FE velocities will vary) has to be traveling at just around 1000 mi/h. (I'm using 24k miles, a reasonable circumnavigation by airplane, it's slightly smaller on the ground but you do get the point). This means that standing here on earth we would readily be able to feel which way south is because we would constantly be pulled that way. The only livable place on earth would be the north pole.
I figure the response you would give, barring this bit is that 'centripetal force doesn't exist in an inertial frame' or that I'm talking about centrifugal force not centripetal force, so I'll address the problem first. A centripetal force would be needed to remain stationary on a spinning disk, because of the radial acceleration (acceleration due to a change in direction as supposed to a change in speed). I can also prove that centripetal force exists in the reference frame of earth, inertial or not. when a car corners too fast, it either slides out, flips, or simply understeers, not taking the path desired. This is absolutely due to centripetal force induced by changing the direction of travel.