Unit 4 Fun with science Integrated skills （2） 教案-2025-2026学年高中英语译林版选修第一册

课 时 教 案 课题：Integrated skills (2) U4 选修一 第　 　课时 总序第 个教案 课型： New lesson 编写时间: 2025年 月 日 执教时间：2025年 月 日 教学目标： 批　注 1. write an article about friction; 2. recognize the importance of friction in daily life. 教学重点： write an article about friction; 教学难点：write an article about friction; 教学用具：Multi-media 教学方法：Group work, discussion 教学实施过程： 1.Have students finish part C on page 52. Remind them that the expressions listed on this page can be used in their discussion. 1)What is friction? 2) In what situations is friction useful? 3) In what situations is friction unnecessary? Expressing certainty: 1)It goes without saying that … 2)Without doubt, … 3)It is certain/clear/obvious that … 4)Clearly/Obviously/Surely, … 5)There’s no doubt that … 6)I’m sure/certain that ... A: Do you know why your pen doesn’t fall when you hold it? B: Of course I do. Friction! It’s the force that makes it hard for the pen to slip from my fingers. A: Exactly! But it’s more complicated than we think and scientists have been studying it for centuries. Scientifically, friction is the force that makes it difficult for one object to slide over the surface of another or to move through a liquid or gas.Without doubt, it’s necessary in many everyday situations, like when you hold your pen, turn pages, or scroll the screen on your mobile devices. 批　注 B: True. Friction helps us in other amazing ways too. For example, on the Earth’s surface, it greatly decreases the speed of the wind, protecting us from experiencing very strong surface winds all the time. Obviously, without friction, most windy days would make our lives very uncomfortable, and they may even be quite dangerous! A: Absolutely! But friction is not always necessary. Some situations require less or even zero friction. For example, mechanical systems that use moving parts work better with less friction because the constant friction generates heat and damages these parts. 2. Have students write an article about friction, paying attention to the text type, structure and language. Remind them that the tip on this page can help them. 3.Have students check their writing after they finish and exchange drafts with their partners for peer review. 4. Have students share their writing in class and evaluate each other’s work. Friction: to slide or not to slide? We walk every day without slipping, but we easily slip if we walk over a patch of ice. We know why this happens. It is due to friction, which is the force that makes it difficult for one object to slide over the surface of another or to move through a liquid or gas. Friction has fascinated scientists for centuries and for good reason. It is a force that we cannot resist, yet in various situations, it affects us either positively or negatively. The future of friction or zero friction looks promising. Researchers are working on many possible applications such as travelling through frictionless tubes, so-called hyperloops, at over 1,000 kilometres per hour. On a smaller scale, the electric charge that friction produces has inspired scientists too. They believe it can be captured and used to power mobile devices and sensors. Since Da Vinci experimented with friction in the 1400s, our understanding of friction has grown enormously. There is no doubt that a wide range of potential applications of friction or zero friction are in store for us. The question is: how are we going to take advantage of this universal force? Do we want objects to slide or not to slide? 教学反思： 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $$