教学九年义务教材小学自然第二册的《浮与沉》一课时,为了让学生自己探讨求真,我是这样教学“改变物体在水中变浮为沉的方法”的 一、观察思考 学生了解常见物体在水中的沉浮情形后,我把带盖塑料瓶放入水中,让学生观察。 师:塑料瓶是沉是浮? 生:浮。 师:想一想,怎样才能使浮在水面上的带盖塑料 Teaching nine-year compulsory primary school textbooks Volume II “floating and sinking” class, in order to allow students to explore truth-seeking, I was teaching this “change the way things float in the water,” one observation and reflection students understand Common objects in the water after the ups and downs, I put covered plastic bottles into the water for students to observe. Teacher: plastic bottle is Shen floating? Health: floating. Teacher: Think about it, how to make covered plastic that floats on the water