比萨斜塔为什么不会倒下？.docx

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15、MsoHyperIinkFoIIowedCO1OR:purp1e;TEXT-DECORATION:underIineDIV.MyFavJ191027653885DIV.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。这句话缺乏以让学生理解，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反面穿过重心，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；图C2、在纸盒的底部的一侧放一木块，使纸盒倾斜的角度较小，重垂线仍然“在物体底部的支承面内，纸盒也不会倒下图D；图D3、不断增大纸盒倾斜的角度，一直到重垂线与斜线重合，即“重垂线通过支点，纸盒也不会倒下图E；图E4、继续增大纸盒倾斜的角度，当重垂线一过了支点，纸盒就会立即倒下图F。图F通过实际教学的检验，效果不错，学生很容易就理解了教材中的这句话