力矩和力矩平衡是高中物理教学的难点之一,也是教学的重点.让学生用单臂梁做有关实验,实践证明,能使学生对力臂,力矩,有固定转动轴物体的平衡条件等概念和规律有进一步的理解.实验装置,如图1所示,它由支架轴架1、单臂梁2、量角器3、可移动的量角器4组成.支轴架是用三块胶合板用乳白胶贴合而成的(见图2),外面两块是三层胶合板,长16厘米,宽1.(?)厘米,在适当的位置 Balance of moment and moment is one of the difficulties in high school physics teaching, and it is also the focus of teaching. Students are allowed to use a single arm to do the experiment, and it is proved that the students can balance the arm, the moment, and the balance condition of the fixed axis object. There is a further understanding of the law. The experimental device, as shown in Fig. 1, consists of a support bracket 1, a one-arm beam 2, a protractor 3, and a movable protractor 4. The support is a three-plywood with a paste sticker. Combined (see Figure 2), the outer two pieces are three plywood, 16 centimeters long and 1. centimeters wide, in place