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牛顿第三定律,说明了物体间相互作用的关系,揭示了物体相互作用的规律,是中学物理教学的一个重点,也是一个难点。定律的内容,看来不难记得,可是定律的精神实质,并不容易理解,以致运用时常常谬误百出。我在教学中不是让学生机械地背诵条文,而是重在帮助学生消除疑惑,加强理解,主要采用下述一些办法: 一、事例论析学生初学时对作用力和反作用力大小相等,往往抱怀疑态度,他们举出诸如刀切豆腐、人拉动小车等事例,证明主动力(作用
Newton’s third law explains the relationship between objects and reveals the law of interaction between objects. It is a key point in physics teaching in middle schools and a difficult point. The content of the law seems to be easy to remember. However, the spirit of the law is not easy to understand. As a result, the use of the law is often delayed. In teaching, I do not allow students to mechanically memorize articles. Instead, they focus on helping students to eliminate doubts and strengthen understanding. The following methods are mainly used: I. Analysis of students’ examples: When students begin to learn, they have equal force and reaction force. With skepticism, they cited examples such as knife-cut tofu and people pulling carts to prove the main motivation