人教 必修三 Unit 4 Astronomy: the science of the stars Using language 课件 （共38张PPT）

课件38张PPT。Unit 4Unit 4 Astronomy: the science of the starsIsaac Newton 1642～1727 英国物理学家 经典物理学理论体系的建立者Pre-listening 1665年创立微分；1666年开始研究积分。1666年, 开始想到研究重力(gravity)问题，苹果落地的传说，也是在此时发生的轶事。其一生的重大科学思想是在这两年期间（22至23岁）形成的。1669年，把《自然哲学的数学原理》，《宇宙体系》等手稿送到剑桥大学图书馆收藏。晚年研究宗教。Albert Einstein (1879～1955) 质量(m)和能量(E)的相当性：E＝mc2 爱因斯坦在量子论、分子运动论、相对论(Theory of Relativity)等物理学的三个不同领域取得了历史性成就，特别是狭义相对论的建立和光量子论的提出，推动了物理学理论的革命，他对社会进步事业也有重要贡献。Stephen Hawking born in 1942 斯蒂芬·藿金是当今科学界的一位 传奇人物。这不仅仅因为他是一位被誉 为继爱因斯坦后最著名的科学思想家和 最杰出的理论物理学家，还在于他是在 常人无法想象的身体状况下进行研究和 创造性工作的。black hole 黑洞 黑洞并非只是吞噬物质。除了会在 星系形成的过程中扮演重要角色外，在 经过一段相当漫长的时间后，黑洞也会 把一些曾被它吸入的物质信息向外界释 放出来。Now we’re going to listen to a talk about the theories of gravity. Listen carefully and try to get the main idea of it.Listening A The text is about how three scientists wanted to find out about the beginning of the universe. B The text is about how the idea of gravity has developed over a long period of time. C The text is about the importance of three scientists and their work.Choose the best summary.Summary B is correct because it gives a clear idea of what the listening passage is about. Summary A is not true. The three scientists wanted to explain how the universe worked and not how it began. Summary C is too general and does not give enough detail about what the listening passage is about.Listen to the tape again and fill in the chart.Large bodies have a force which pulls things towards them.In space large objects make space and time bend; the larger the object, the further space and time bend.Black holes have a very large mass and pull things towards them.The bigger the object the stronger the gravity.Time goes slower in very strong gravity.If you go over the edge, you cannot get out; but if you do not, you may be able to escape.spacewalkLook at the pictures! Read the passage carefully and then describe the three ways in which gravity changed for Li Yanping and how his weight changed.1. The pull of gravity became very strong he left the earth’s atmosphere. His weight is normal.2. It disappeared when he was in space. He is weightless.3. It was very light when he was on the moon. He weighs less than on earth.1. ... “walking does need a bit of practice now that gravity has changed.” ......既然引力改变了，走路也的确需要练一练了。 now that同since相似，语气较弱，强调人们已知的事实。Language pointsTranslation. 1) 既然你忙, 就让我给你做吧。 Now that you are busy, let me do it for you. 2) 既然人都齐了, 咱们开始干吧。 Now that everyone is here, let’s start work.2. We watched, amazed as fire broke out on the outside of the spaceship as the ea ... ...