我听了一位老师的一堂自然课,讲的是第三册第十五课“大气的压力和浮力”。在整个教学过程中,充分体现了以教师为主导,以学生为主体的精神,教师教得得法、学生学得灵活,收到了良好的教学效果,不失为一堂自然教学改革课。现简介于后。一、提问质疑,激发兴趣。本课在“水的压力和浮力”一课的基础上指导学生认识大气的压力和浮力。为了活跃课堂气氛,一开始,教师就提出问题:我们知道了水有压力,空气是不是也有压力?学生议论开了,有的说有,有的说没有,但都说不出理由,只好眼望老师,聚精会神地等待了。这时,教师拿出一个注射器,把一个弹簧放入注射器内,再把活塞推入,松开压在活塞上的拇指,活塞马上被弹簧推了出来。“要使活塞不被推出来,该怎么办?”教师问。“用大拇指压在上面”。全班齐 I listened to a natural lesson from a teacher about Lesson 15, Book Three, Atmospheric Pressure and Buoyancy. Throughout the teaching process, the spirit of taking teachers as the mainstay and students as the mainstay has been fully demonstrated. Teachers can teach well, students learn flexibly and have received good teaching results, which will be a natural teaching reform class. Now in brief. First, question the question, stimulate interest. This lesson guides students to atmospheric pressure and buoyancy based on the lesson “Water Pressure and Buoyancy.” In order to be active in the classroom atmosphere, from the outset, the teacher asked questions: We know that there is pressure on the water, the air is not also under pressure? Some students said something was open, and some said no, but they could not justify it. Looked at the teacher, attentively waiting. At this time, the teacher took out a syringe, put a spring into the syringe, and then push the piston, release the pressure on the piston thumb, the piston was immediately pushed out by a spring. “What should I do if the piston should not be pushed out?” The teacher asked. “Thumb pressure on it.” All classes Qi