“制作简易密度计”是苏科版第十章的结尾内容,对浮力知识点在不同情况下的运用做了很好的归纳与总结,能够让学生运用知识,自己动手,在处理问题时,通过浮力知识分析解决问题,完善了知识,也锻炼了动手能力。一、课前预习,为课上活动做好准备综合实践活动课的容量大,只利用课堂时间是不够的,我们要充分做好课前的准备工作,让学生先自己学习、思考,将浮力知识进行回顾,这样便于课堂上解决问题更具有针对性,做到教学的有效高效。在学习的前一天,让学生在家中做小实验:将鸡蛋放在水中,加盐搅拌后鸡蛋能漂浮在水面上,继续往水中加盐搅拌,随着盐水密度的变化,观察鸡蛋露 “Making simple density meter ” is the end of the tenth chapter of the Suke version, the use of buoyancy knowledge points in different situations made a very good induction and summary, enabling students to use knowledge, do it yourself, in dealing with the problem By buoyancy knowledge analysis to solve the problem, improve the knowledge, but also exercise the ability. First, the pre-class preview, preparation for class activities Comprehensive practical activities of the class capacity, only the use of classroom time is not enough, we must fully prepare for the preparatory work for students to learn their own, thinking, the buoyancy Knowledge review, so that it is easier to solve the problem in the classroom more targeted, effective and efficient teaching. The day before the study, let the students do a small experiment at home: the eggs on the water, add salt, eggs can float on the water after mixing, continue to salt water mixing, as salt water density changes observed egg dew