在现行的科学教学中,教师对于力臂的教学大多采用了直接讲述的方法,其结果是学生很难理解力臂这一概念,更不用说熟练处理力臂的有关问题了。而构建模型法正是突破抽象科学概念这一教学难点的一把利器,它能使学生面对具体模型作积极的思考,既能大大降低教学难度,又能使学生学到处理问题的方法,提高学生学习科学的能力。 In the current teaching of science, teachers mostly adopt the direct method for teaching arm and arm. As a result, students find it hard to understand the concept of arm, not to mention the problem of skillful handling. The model building method is a sharp weapon that breaks through the difficult teaching of abstract science concept. It can make students face the concrete model for positive thinking, which not only can greatly reduce the difficulty of teaching, but also enable students to learn the way to deal with the problem, Improve students’ ability to learn science.