| A20-2 | Multi-stage vertical collision balls. |
| Purpose: | To demonstrate the laws of momentum and energy in action. |
| Description: | The multi-stage vertical collision balls consists of a plastic stick with four superballs of decreasing diameter impaled on it. Place a fifth ball over the top, hold the assembly by the stick and drop it. The top ball will take off skyward as high as 10 m. |
| References: | |
| Equipment: | Multi-stage vertical collision balls. |