老师下发的研究今年的IYPT的第十一个题目 题目如下 11. Rolling on a Disc
If you put a light rolling object (e.g. a ring, a disc, or a
sphere) on a horizontal rotating disc, it may start moving
without being expelled from the disc. Explain how different
types of motion depend on the relevant parameters.
求大神指导一下思路什么的。