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1 创设情境,引入新课(多媒体显示)春秋时代鲁国的公输班(后人称鲁班,被认为是木匠业的祖师)一次去林中砍树时被一株齿形的茅草割破了手,这桩倒霉事却使他发明了锯子.教师:请同学们思考,鲁班是受到什么启发发明锯子的?学生1:因为齿形的茅草割破了手,所以他想齿形的锯子也能割破手.(此时其他同学纷纷表示不赞同)学生2:鲁班被割破手的时候还没有锯子.应该是齿形的茅草能割破手,那么能割断木头的工具也可能是齿形的.(大部分同学表示赞同)
1 Creating Situations and Introducing New Courses (Multimedia Display) The Spring and Autumn Period Lu Guo’s public transfer class (later known as Luban, considered to be the carpenter’s founder) was cut by a tooth-shaped thatch when they went to the forest to cut trees. This unlucky thing led him to invent the saw. Teacher: Ask the students to think, what inspired Luban to invent the saw? Student 1: Because the tooth-shaped thatch cut his hand, he saw the tooth-shaped saw Cut the hand. (At this time other students have expressed disapproval) Student 2: Lu Ban was not sawing his hands when cutting. It should be tooth-shaped thatch can cut his hand, then the tool that can cut the wood may also be toothed (most students agree)