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学生在初中已学习力的作用是相互的,即A对B有力作用的同时,B对A也有作用力。他们还知道这对力作用在不同物体上,以此来区分一对相互作用力和一对平衡力。但初中教材只指出力的作用是相互的,并没有给出这对力的名称,也没得出作用力和反作用力之间的大小关系和作用线关系。基于以上分析,笔者着重谈谈在高中阶段教学牛顿第三定律时,探究作用力与反作用力的定量关系创新设计,并突破探究非接触力间相互作用的定量关系。
Students have the power to learn in junior high school is mutual, that is, A has a strong effect on B, B also has a force on. They also know that this pair of forces act on different objects in order to distinguish between a pair of interacting forces and a pair of balancing forces. However, junior high school teaching materials only pointed out that the role of force is mutual and does not give the name of the force nor the relationship between the size and the line of action between force and reaction force. Based on the above analysis, the author focuses on the innovative design of quantitative relationship between force and reaction in the teaching of Newton’s third law in high school, and explores the quantitative relationship between the interaction of non-contact force.