to Japanese

How to use:

This applet simulates bouncing balls in a box.

• The "Enter a New Ball" button

  Click to throw a new ball in the box.

• The "Clear all Balls" button

  Click to clear all balls from the box.

• The Radio Buttons ( colored )

  Click to set the color of the ball that will be thrown in the next time.

• The Scroll Bar on the left side

  Drag to modify the gravity in the box.

• The Scroll Bar on the right side

  Drag to modify the restitution of the walls.