It is the same when rockets work. They burn fuel to push matter out the back forcefully. The rocket moves in response to this. Since a rocket weighs much more than a balloon, of course, it takes more fuel to get it moving.
【诱思导学】
1.Do you like doing scientific experiments? What are the stages of a scientific experiment?
.
【答案】 Yes, I do. The stages are as follows: aim—method—result—conclusion.
2.What will happen when the air in the balloon is receased?
【答案】 When the balloon's mouth is open,the air will push the balloon to move.
Period ⅠPreviewing
(教师用书独具)
●教学目标
本课时主要是通过学生对学案所给出的内容的学习,了解本课文中所出现的词汇,初步了解课文以及相关的背景知识,对下一堂课对课文的全面理解起到一个铺垫作用。
●教学地位
该部分列举了与科技、实验有关的词汇,并设计了三个练习活动。通过这三个活动,学生可以初步熟悉这些词的意义,为以后的各项学习活动做好准备。
(教师用书独具)
●新课导入建议
(1)Ask the students to read through the questions quickly.
How does water exist?
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