I Ponder why

Ever wonder why a top that is spinning will not tip over until it stops spinning?..

or if you hang a bycicle wheel on a rope spinning it will spin vertically, until it slows down, then it falls over limp..

here is a good one, everyone has seen a figure skater spin with her arms open, then when she moves her arms inward, she spins faster, then moving her arms out agains slows her down again.. hmmm..