苏教版物理八年级(下),教材在编排了压强、浮力知识后,紧接着安排学生根据浮力知识“制作密度计”的综合实践活动,这无疑体现了新课改的精神,让物理知识走向社会,走向生活.笔者有幸指导学生参与“制作密度计”的综合实践活动,发现学生在制作过程中,遇到的困难层出不穷,出现的情况出人意料,制作过程往往停滞不前,课堂效果低下.鉴于学生接触物理时间不长,没有较高的理论水平和分析能力,据此,为了降 The eighth grade of physics (eighth grade), the textbook in the arrangement of pressure, buoyancy knowledge, followed by arrangement of students based on buoyancy knowledge “production density meter ” comprehensive practice, which undoubtedly reflects the spirit of the new curriculum reform, let Physical knowledge to the community, to life.I was fortunate enough to guide students to participate in “production density meter ” comprehensive practice and found that students in the production process, the difficulties encountered after another, the situation is unexpected, the production process is often stagnant, Classroom effect is low. In view of the student physical contact time is not long, there is no higher theoretical level and analytical capabilities, accordingly, in order to reduce