| 摘要 |
A novel ball toy is disclosed that is formed from a first shaped volume of material. The first shaped volume of material has a first nut embedded within the first shaped volume of material between a first predetermined position and a second predetermined position, the first nut comprising an inner thread approximately concentric with a first center axis of the shaped volume of material. A first bolt having a head and an outer thread disposed about a shaft thereof for having the shaft controllably threaded into the inner thread of the first nut for frictional engagement therewith. A variation of the separation between head of the first bolt and the first shaped volume of material is used for varying a trajectory of the ball toy when rolled.
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