浙江省杭州市塘栖中学高中英语必修三：Unit4usinglanguage1教学课件.ppt

Using Language; spaceship pull float mass; cheer up now that break out watch out ;Isaac Newton 1642～1727; 牛顿经典物理学理论体系的建立者。 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）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）; 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·霍金是当今科学界的一位传奇性人物。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。;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 periods of time. C The text is about the important of three scientists and their work.;Listen to the tape again and fill the chart below;;;Listening text ; Part 1 MJ: Hello, Dr Li Yanping. It’s so good of you to talk to me. Some students ask us why things always fall back to earth if you throw them up in the air. Could you explain it? LY: Well, at first, people thought it was because the earth was the center of the universe. Of course that was wrong.; One day Isaac Newton watched an apple fall to the ground. He said that something else must be pulling the apple back to Earth. He called it “ gravity”. MJ: I see. Did people accept his idea? LY: They did. Later they worked out that bigger objects (like the sun) have stronger gravity than smaller objects (like our planets). If you’re travelling in deep space, ; you couldnt fall back to the earth. You’re just too far away. Part 2 MJ: Does it mean there’s no gravity in space? LY: No. In a spaceship you would feel the pull as it got closer to such an object. You would travel faster and faster towards it. MJ: Until you hit it?;LY: Not exactly. You may pass it very fast and then it would throw you out into space again. After that you would slow down to the usual speed. MJ: How do you know this? LY: In 1905 Ein