Momentum is the most entertaining physics toy ever created. Spin it once and you will be addicted as you witness angular momentum drive this one-inch engineering masterpiece with so much energy that it looks, sounds and feels alive. Hand-powered with a single pull of a string, Momentum is more than the world’s longest spinning 38 gram top. It is a completely new way to experience Newton’s Laws of Motion by accelerating from zero to 15,000 rpm in less than one second!