Wednesday Throw a baseball into the air and it travels in a nice, smooth arc. Now imagine tossing an irregular object, like a baseball bat it the air. But if you look closely, you'll see both ends of the bat are whirling around one point that follows the same smooth arc as the ball. This is the bat's center of gravity. Pick up the bat, and you'll discover you can balance it on your finger at precisely this same point.
Every object has a center of gravity somewhere.
Take a doughnut, for instance. The doughnut's center of gravity, or average position of all its mass, is at a point in the hole. See Montshire's new exhibit Amusement Park Science , opening Saturday, March 11. Thursday Whether you realize it or not, you perform a pretty amazing feat every single morning, just by getting out of bed. I can tell you're not impressed.