人们在生活中经常有这样的生活经验:放飞的氢气球能飞上天,木块按在水中能浮起来等等.通过这些生活经验认识到空气、水中的物体都受到浮力的作用.一、我们的教学设计要符合人类的认识规律物理老师要了解人类的认识过程,找到学生的“最近发展区”.在引入新课时可以放飞氢气球,让学 People often have such life experiences in life: the flying hydrogen balloon can fly to heaven, the wooden block can float in the water, etc. Through these life experiences, it is recognized that the air and the objects in the water are buoyant. The teaching design should accord with human’s cognition law Physics teacher should understand human’s cognition process and find the student’s “recent development zone”