WHYS THE BUTTERFLY EASIER TO USE?
The reason a heavier yo-yo handles better than a cheap one is moment of inertia. With more moment of inertia, the Duncan yo-yo accelerates slower, flings out with more control and, once in motion, stays in motion. Additionally, a heavy yo-yo’s weight is positioned at a greater radius from its axis, further benefiting the moment of inertia and increasing its ability to maintain angular momentum (an object’s resistance to rotating and rocking on its axis).
