Small ball bouncing looks very basic, but in fact it can be used on different characters as well as different objects, and in most of the animations there is Small ball bouncing looks very basic, but in fact, it can be used on different characters as well as different objects, and in most of the animations there is actually a small ball bouncing motion pattern. We first felt different weights and masses of small balls in the classroom, such as ping pong balls, bowling balls, leather balls, etc., and felt the different laws of bouncing motion from the fall of real objects. It can be seen that the principle of the ball bouncing is subject to gravity falling (showing acceleration), contact with the ground reaction force bouncing (also affected by gravity, decreasing speed), and because there is resistance, the height is also getting lower (a decreasing change).