|MLA Citation:||Bloomfield, Louis A. "Question 1317"|
How Everything Works 18 Oct 2017. 18 Oct 2017 <http://howeverythingworks.org/print1.php?QNum=1317>.
Most of the missing collision energy is lost because of sliding friction within the ball. Molecules move across one another as the ball's surface dents inward and these molecules rub. This rubbing produces heat and diminishes the elastic potential energy stored in the ball. When the ball subsequently undents, there just isn't as much stored energy available for a strong rebound. The classic dead "ball" is a beanbag. When you throw a beanbag at a wall, it doesn't rebound because all of its energy is lost through sliding friction between the beans as the beanbag dents.