1对教材中学生实验的分析在苏科版9年级物理上册第11章第1节杠杆中,教材安排了探究杠杆平衡条件的学生实验(图1),具体操作如下.在下列情况下测量并记录动力F1、动力臂L1、阻力F2、阻力臂L2的大小(表1).(1)保持钩码和弹簧测力计的位置不变,改变钩码的数量.(2)保持钩码的数量和位置不变,改变弹簧测力计的位置.(3)保持弹簧测力计的位置和钩码数量不变,改变钩码的位置. 1 Analysis of textbook students experiment In the 9th grade of Sukko Physics, Chapter 11, Section 1 levers, the textbook is arranged to explore the lever balance conditions of the student experiment (Figure 1), the specific operation is as follows measured and recorded Power F1, power arm L1, resistance F2, resistance arm L2 size (Table 1) (1) keep the hook code and the spring force gauge position unchanged, changing the number of hook code (2) to maintain the hook code number And position unchanged, changing the position of the spring force gauge (3) to maintain the position of the spring force gauge and the hook number unchanged, changing the hook code position.