比萨斜塔为什么不会倒下？

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15、885SPAN.MsoHyperlinkFollowedCOLOR:purple;TEXT-DECORATION:underlineDIV.MyFav_1191027653885DIV.Section1page:Section1比萨斜塔倾斜的角度很大，但是到现在都没有倒下，这是为什么？只说“从重心引出的重垂线，如果通过支点或在物体底部的支承面内，物体就不会倒下。”这句话不足以让学生理解，为此我设计了一个实验来验证比萨斜塔为什么不会倒下。材料：一个大小适中的纸盒（如手机的包装盒、西药的包装盒）细线、缝衣针、木块。制作方法：1、在纸盒的正面上用笔画出其重心位置（图A）；图A图B2、用带有细线的针从纸盒的背面穿过重心，并固定在重心的位置上（图B）；说明：带有细线的缝衣针就相当于“从重心引出的重垂线”；操作方法：1、把纸盒放在水平桌面上，“重垂线在物体底部的支承面内”，纸盒不会倒下（图C）