| A9-3 | Center of mass, Unicycle. |
| Purpose: | To demonstrate center of mass. |
| Description: | A toy unicycle rider carries a balance pole which places the center of mass below the bottom of the wheel. The rider and cycle are mounted on a string which is tied at one end and may be raised or lowered at the other. The rider will move along the string without falling. |
| References: | Mp-6. |
| Equipment: | unicycle toy , string. |