哪个跑的快

       重量相同，质量分布不同的物体转动惯量不一样，把两只重量相同质量分布不同的转轮同时沿轨道滚下观看哪只轮子滚速快 

Which Is Faster

        The rotation-inertia of the two objects is not the same, which are the same in weight but are different in the distribution of the mass.Method of operation: To roll the two wheels simultaneously along the rail, which are the same in weight but are different in the distribution of the mass, and observe which is faster.