牛顿第二定律是力学的核心内容.而现行人教版高中物理教材却删去了“验证牛顿第二定律”这一学生实验,因此,教师在教学中做好演示实验成了关键.但笔者认为按现行教材中的实验装置演示存在不足:一是两车在同一水平面上运动,不便学生观察对比;二是用铁夹难于控制两小车同时开始运 Newton’s second law is the core content of mechanics. However, the current PEP physics textbook has deleted the student experiment of “Verifying Newton’s Second Law”. Therefore, teachers are the key to doing demonstration experiments in teaching. But the author It is considered that there are deficiencies in the demonstration of the experimental device in the current textbook: First, the two vehicles move at the same level, which makes it difficult for the students to observe and contrast; second, it is difficult to control the two small cars with the iron clamps to start transporting at the same time.