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一、创设情景提出问题在讲台上放置《振动图线演示器》和《波动图线演示器》,使学生一到教窒就引起学习的兴趣和思索本节课所要研究的问题。教师:用教鞭指示讲台上两架仪器,问学生:它们各是研究什么物理问题的?学生:研究振动图象和波动图象的。教师:请同学们观察仪器,观察图象,教师并作演示。演示完后,又问学生:两个图象的形状及变化规律有何特点?学生:图线规律相同,都是按正弦(或余弦)规律变化。教师:那么两图线有什么区别呢?
First, create a scenario to ask questions Place “Vibration Diagram Demonstrators” and “Wave Diagram Demonstrators” on the podium so that students will become interested in learning as soon as they arrive and think about the issues to be studied in this class. Teacher: Use the pointer to indicate the two instruments on the podium and ask the students: What are their physical problems? Students: Studying vibration images and wave images. Teacher: Ask the students to observe the instrument, observe the image, and give the teacher a demonstration. After the presentation, ask the students: What are the characteristics of the shape and change laws of the two images? Students: The rules of the lines are the same, and they are all changed according to the sine (or cosine) law. Teacher: What is the difference between the two maps?