No, Dave.<quoted text>
Not really. That is not gravity keeping the water in the bucket. Gravity is what makes it spill. What you are describing is arrested motion of mass. The earth does similar with the motion caused by gravity being arrested by inertia. Lets matter collect.
BTW, your shoulder is what takes the beating on that.
EM is the force. It kicks gravity's butt. Why you are standing and not a puddle on the ground.
It's not the "arrested motion of mass", and it's not some conspiracy-style EM woo.
It is in fact the continual motion of mass. In this case, centrifugal force.
Actually, it's properly centripetal force.
Basic mechanics, Dave. Look it up.