《反冲》一课是九年义务教育六年制小学自然教科书(人教版)第九册第15课。教材首先是把一高塑料瓶斜着钻孔,往瓶内倒水,观察水和瓶的运动方向;接着观察气球放气时的反冲现象;然后在这两个实验的基础上,指导学生归纳概括出“反冲”;最后让学生了解反冲的应用。 这样组织教学,学生在特定的指向下,较容易得到结论,而且实验也勿需学生动太多的脑筋就能完成,但对学生实验能力的培养却不够深入。本来气球就是学生的常 The “recoil” lesson is a nine-year compulsory education six-year primary school natural textbook (PEP) ninth ninth class. The teaching material is firstly to drill a hole obliquely to a tall plastic bottle, pour water into the bottle, observe the movement direction of the water and the bottle, then observe the recoil phenomenon when the balloon is deflated, and then guide the students on the basis of these two experiments Summarize the “recoil”; finally let students understand the application of recoil. This organization of teaching, students in a particular direction, easier to draw conclusions, and experiments do not need students to move too much brains can be done, but the cultivation of students' experimental ability is not deep enough. Balloon is the student's usual