Main Question or Discussion Point
My intuition is if an object is orbiting a centre, it is accelerating as the direction of its vector constantly changes, i.e a ball orbiting a stick because they are tied by a string. I dont understand why Earth's spin does not slow down, if we think of Earth as lots of individual atoms, those atoms are all orbiting the earth's axis without slowing down yet their direction is always changing. It is as if a force is applied to them to change their direction. Please guide/correct me.