(材料:木箱,纸风车,铁环) 师:请同学们利用自己桌上的实验材料研究一下这些物体受到外力以后会怎样运动?(学生实验) 生(1):木箱在推动,纸风车在转动,铁环在滚动。生(2):我不同意木箱在推动,推动是指人在推木籍,而不是木箱运动的方式,应该说木箱在移动。生众:对,木箱应该叫移动。师:太家讨论得很好。你们都玩过秋千,那么,谁能 (Materials: wooden box, paper windmill, iron ring) Teacher: Students are invited to use their own experimental materials on the table to study what these objects will be subjected to external forces after exercise? (Students experiment) Health (1) The windmill is turning, the hoops are rolling. Health (2): I do not agree with the promotion of wooden box, promotion refers to people pushing wooden membership, rather than wooden box movement, it should be said that the wooden box is moving. Students: Yes, wooden boxes should be called mobile. Teacher: Too much discussion. You've all played swing, then, who can