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某出版社出版的《高中物理练习》上册中有这样一道题:例1．如图1所示,一个正方形的箱子,下面安装几个高度不计的小轮子,并认为两小轮之间的距离就是箱子的边长,箱子的质量为m,小轮子的质量不计。
A book published in the “High School Physics Exercise” published by a publishing house contains such a question: Example 1. As shown in Figure 1, a small box of squares is fitted with several small wheels that are not counted. The distance between the two small wheels is the side length of the box. The weight of the box is m, and the quality of the small wheels is not counted.