I've been thinking about centripetal force and circular motion. I know that an object experiencing circular motion has a velocity vector tangential to the circular path and an acceleration vector perpendicular to its motion, pointing towards the center of the circle. What I don't get is why doesn't the inward acceleration cause the object to move radially inward towards the center of the circle, like a spiral. How is it that radially inward acceleration doesn't always result in radially inward motion? Any explanation will be greatly appreciated.