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一、引入课题师:今天,老师给大家带来了一份特别的礼物(出示摆钟图片),想知道是什么吗?生:钟。师:这个钟有什么特点?生:外面有时间刻度,里面有一个可以摆动的东西。师:因为它是靠这个东西来回摆动计时的,所以叫摆钟。知道摆钟是怎么发明的吗?请同学们阅读教材第85页的科技史内容。(学生阅读相关内容。)师:伽利略在观察教堂里的吊灯时发现了什么现象?生:吊灯有节奏地来回摆动。师:他对这种现象进行了怎样
First, the introduction of subjects Teachers: Today, the teacher brought everyone a special gift (showing pendulum clock picture), want to know what is it? Teacher: What are the characteristics of this clock? Students: there is time scale outside, there is a swinging things. Teacher: Because it is based on this thing back and forth swing timing, so called the pendulum clock. Do you know how pendulum clocks were invented? Ask students to read the history of science and technology on page 85 of the textbook. (Students read the relevant content.) Teacher: What did Galileo observe while observing the chandeliers in the church? Health: The chandelier swung back and forth rhythmically. Teacher: What has he done with this phenomenon?