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新教材把简单机械和机械效率分别安排在初中物理课本的第一册第十二章和第二册的第二十章的第四节。这种安排出于从知识体系和同学们的认知规律考虑。具有必然联系的知识跨越两个年级段、两本书,学习中有许多含糊不清的认识,对知识的联系也很难找到连接点。采用归类复习对于消除学习中的模糊感,增强对知识的理解、形成知识体系大有益处。
The new textbook places simple mechanical and mechanical efficiencies in the fourth chapter of Chapter 12 of Book 1 and Book 2 of Book 2 of the Physics textbook for middle school students. This kind of arrangement is based on considerations from the cognitive system of the knowledge system and the students. The knowledge that is inextricably linked spans two grades and two books. There are many ambiguous cognitions in the study, and it is difficult to find connections between the knowledge. The use of categorical review is useful for eliminating ambiguity in learning, enhancing understanding of knowledge, and forming a knowledge system.