有一位物理教师教力的概念时,先提问:“谁能讲出力的表现?”学生回答很踊跃:“人提水”,“起重机吊钢管”,“磁铁吸铁钉”等。教师将学生的回答列表板书后,进行概括: 人、起重机、磁铁都是物体,水,钢管、铁钉也是物体,提、吊、吸在物理学中称为作用,由此总结出力的初步概念是物体对物体的作用。这位教师在教学中遵循了一条原则:循序渐进,让学生由 There is a physical teacher teaching concept, the first question: “Who can speak out the performance of?” The students responded very enthusiastically: “people mention the water”, “Crane Crane”, “magnet suction nails” and so on. Teachers will be the students list the answers to the book after a summary: people, cranes, magnets are objects, water, steel pipe, iron nails are objects, lifting, hanging, called in the role of physical absorption, which concluded that the initial concept of force Is the role of the object on the object. The teacher followed the teaching of a principle: step by step, so that students from