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No. 2 Middle School, Shijiazhuang Duanjianru Franklin’s Famous Kite Experiment 16 Pre-reading • Look at the pictures. • Who are they? Are they famous? • What are they famous for? Edison •electric bulb Be llIt was Alexander Bell who invented the telephone. ~ is considere to have inve ted he telephone. Elbert Einstein•theory of relativity Isaac Newton (1643-1727) •the law of gravitation Charles Darwin (1809-1882)Dead-leaf mimic katydid •theory of evolution Periodic table of elements Mendeleev (门捷列 夫 ) (1834~1907) He’s in Sanguo (三国 ) dynasty(朝代 ). He worked on medicine. He was killed by CaoCao(曹操 ). He invented the anesthetic named Mafeisan( 麻沸散 ) HuaTuo (华佗 ) •radium Madame CurieLaite Brothers Are these discoveries important? Life without electricity Benjamin Franklin 1706-1790 Do you know? He was born on January 17, in Boston in Masachusetts, and was the tenth child and youngest son of the family. His father was a candle maker. When he was young, he was not very good at math. He was curious and loved to learn about new things but he had only less than three years of formal education. He invented lightning rod.(避雷针 ) He helped set up America’s first city hospital. He also helped to found a new nation. He helped to write the Declaration of Independence. He was a successful businessman, an inventor, a writer, a scientist and a world- famous statesman. ★Regarded as the US founding father ★ Author of Poor Richard’s Almanac, a book of smart sayings and facts ★ Librarian ★ printer ★ politician ★ inventor Benjamin Franklin (1706-1790) American statesman; inventor; writer; scientist and diplomat. He signed the Declaration of Independence and the Constitution of the United States 哲学家 政治家 The original one If you would not be forgotten, as soon as you are dead and rotten, either write things worth reading, or do things worth the writing. Find the words that fit the descriptionsc______ allow(heat,electricity etc) to pass into a battery. p______ show that sth is true or certain by means of argument or evidence(证 据 ) t______ pull (sth) forcibly apart or away or to pieces f______ firmly attach sth to sth or two things together e______ make sth clear or easy to understand onduct rove ear asten xplain Task 1 Read the text quickly and try to get the main idea of each paragraph. While- reading to make a special kite for the experiment? are the three steps to do the experiment? to do the experiment with a kite, a key and a condenser? did Franklin succeed in doing the experiment? did Franklin do the experimentWhy Franklin’s famous kite experimentPara 1 Para 2 Para 3 Para 4 Para 5 Para 6 Introduction How Ho w What How Look at the textbook and listen to the tape carefully. Task 2 things we need a kite bad weather( thunderstorm) a key a condenser a shed a handkerchief string a key a silk ribbon two pieces of light wood a sharp piece of metal (one foot or more) What do we need to make the kite? 1.build the frame by making a small cross 2.tie the corners to the points of the cross 3.add a tail to the frame 4.tie a long string to the cross 5.fix a sharp piece of metal to the top of the longer stick 6.fasten a key to the end of the long string 7.tie a silk ribbon to the string above the key How to make Franklin’s kite? tail Things needed Functions Franklin’s Famous Kite Experiment a silk kite to last longer in bad weather to direct electricity towards the condensera key bad weatherto have lightninga condenser to collect and store electricity a shed to keep himself and his tools dry so that he himself would not be hit by the lightning Things needed Functions Franklin’s Famous Kite Experiment wooden sticks to build the frame of the kite by making a small cross to control the kite by tying a long string to the cross a string a sharp piece of metal to attract electricity a silk ribbon to protect you from the electricity Consolidation wooden sticks Kite experiment Silk handkerchief silk ribbon key a sharp piece of metal string kite condenser shed bad weather Post- reading Exercise 1 Multiple choice1.Franklin made the kite of silk because ______. A . wet silk does not conduct electricity B . silk kite flies high C . silk kite will last longer in weather with rain and strong winds D . silk kite is cheaper C. silk kite will last longer in weather w th rain and strong winds 2. Which is not stated but can be inferred from the text? A . Franklin did the experiment with the kite. B . Franklin’s experiment with electricity was dangerous. C . Franklin failed the experiment again. D . The experiment was conducted in bad weather. 3. Which of the following is in the correct order? ①The experiment proves that lightning and electricity are the same. ②The kite flew high in the rainy sky. ③He made a silk kite. ④Very sharp piece of metal was fixed. ⑤A key was fastened to the end of the string. ⑥ A ribbon was tied to the string.A . ④ ⑤ ⑥ ③ ② ① B. ③ ④ ⑤ ⑥ ② ①C. ④ ③ ⑤ ⑥ ① ② D. ③ ④ ⑤ ⑥ ① ② True or false? 1.In 1752 scientists already knew what electricity was. 2.Franklin was helped by a friend to do the experiment. 3.Franklin made the kite of silk because wet silk does not conduct electricity. 4.A condenser was used in the experiment to store electricity. 5.The key tied to the string was put into the door to stop the kite flying away. 6.The experiment can be done at any time. T F F T F F • The pictures below show how Franklin did his experiment. Pick out the correct ones. Exercise 3 Which ones are correct according to the text? Benjamin Franklin was a famous American scientist. In June 1752, he did a kite experiment to __________ that lightning and electricity were the same. He made a kite ,which could __________lightning. The kite was made of______ so that it would not ________ too soon. He _________ a very sharp piece of metal and then _______ a key to the ________of the long string and finally he______ a silk _______ to the string, just _______the key. When a __________ appeared, he went to a _________in the field and flew the kite to the sky. Soon he saw the hairs on the string _________ ______ because the string got________. He brought his finger to the string and felt a light but clear _________ ___________. With the help of a key and a ___________,he was able to __________ a great deal of electricity. prove attract silk tear fixed fastened end tied ribbon above thunderstorm shed stand up charged electric shock condenser collect Fill in the blanks. Discussion • Do you think Franklin’s experiment was dangerous? • List the difficulties that Franklin met when he was doing the kite experiment • How did Franklin solve these problems? Discussion Do you think Franklin’s Experiment was dangerous? Why? • It is difficult to go and look for lightning • A kite made of paper won’t last long in rainy weather • A silk kite doesn’t attract lightning • He had to collect and store the electricity • He had to make sure that he would not be hit by the lightning • He had to stop the kite from flying away, without touching the string that would be charged with electricity • He had to direct the electricity towards the condenser • He waited for bad weather and attracted lightning by using a kite. • His kite was made of silk. • He fixed a sharp piece of metal to the top of the longer stick. • He used a condenser. • He used a small shed in the fields. • He tied a silk ribbon to the string that he kept dry. • He tied a metal key to the end of the string. Name Time People Purpose Things needed A record of the experimentKite Experiment Franklin and his sonLightning and electricity are the same. a kite, a key, some really bad weather and a condenser In June 1752 Summary In order to show that lightning and electricity are the same, Franklin built a strong kite .When the bad weather came, he did his experiment by using his kite and condenser. He found that the string was getting charged and he could feel a light but very clear electric shock. So he store much electricity in the condenser.This experiment proved his idea. To do this experiment ,four objects are needed :a kite ,a key , some bad weather and a condenser.Then the next three steps are very important.First, fix a very sharp piece of metal. Second, fasten a key to the end of the long string.Third, tie a silk ribbon to the string. After-class activities: 1. Describe Franklin’s kite experiment. 2. Describe the steps to make a fruit battery. 3.Search more scientists and their famous experiments. Share them! What do you think of Benjamin Franklin? What can you learn from him? Bye- bye!