一、教材内容本课是苏教版《科学》三(下)中《固体和液体》单元的第五课。主要是让学生在动手实践中去探究物体在水中的沉浮变化,了解上浮材料的特点,想办法使下沉的物体浮起来。本课围绕问题“怎样使沉在水里的物体浮起来”展开,能很好地激起学生探究的积极性,通过使下沉的橡皮泥浮起来,使沉在水底的小瓶浮起来和使生鸡 First, the textbook content This lesson is the second edition of the “solid” and “liquid” units in the Sujiao edition of “Science” three (under). Mainly for students in hands-on practice to explore the ups and downs of objects in the water to understand the characteristics of floating materials, think of ways to make sinking objects floating. The lesson revolves around the question, “How do I get the objects in the water to float?” To arouse the enthusiasm of students to explore well, to float the sinking vials by floating them down and Make raw chicken