Biologist Discovered the ancestors of people were monkey Published “the Origins of species” ( 物种起源 ) Darwin

The greatest woman scientist Discovered the radium and polonium( 镭, 钋 ) Her discovery of radium opened the treasure-house( 宝库 ) of atomic( 原子 ) energy She was given two Nobel prizes Madame curie

★ Regarded as the US founding father. He signed the Declaration( 宣言 ) of Independence and the Constitution( 宪法 ) of the United States. American statesman ( 政治家 ) ; inventor; writer; scientist and diplomat( 外交家 ) Benjamin Franklin( )

Franklin’s Famous Kite Experiment 16

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 experiment Why Franklin ’ s famous kite experiment Introduction How What How Para 1 Para 2 Para 3 Para4 Para 5 Para6

Reading

Purpose Results The electricity stored in the condenser can be used to do other experiments, which proves that lightning and electricity are the same. Para2-3 Franklin’s Famous Kite Experiment to show that lightning and electricity are the same

Things needed for the experiment Instructions for Making the kite A kite, a key a condenser, a small shed, bad weather build frame,tie corners to, add a tail to, tie string to the cross. fix metal to,fasten key, tie silk ribbon Para4-5

a kite bad weather( thunderstorm) a key a condenser Attract lightning to direct electricity towards the condenser to collect and store electricity to have lightning

风筝示意图

to attract electricity 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 do the experiment with a kite, a key and a condenser ? Attention items? Para6

111 to keep himself and his tools dry so that he himself would not be hit by the lightning a shed Mustn’t be wet

Discussion Do you think Franklin’s Experiment was dangerous? Why?

Which ones are correct according to the text?

Post-reading

True or false? 1.In 1752 scientists already knew what electricity is. 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

Exercise 1 Multiple choice 1.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 with 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. B. Franklin ’ s experiment with electricity was dangerous.

3. Which of the following is in the correct order? ① The experiment proves that lightning and electricity are the same. ② The kite flew high in the rainy sky. ③ He made a silk kite. ④ Very sharp piece of metal was fixed. ⑤ A 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 ① C. ④ ③ ⑤ ⑥ ① ② D. ③ ④ ⑤ ⑥ ① ②

Consolidation wooden sticks Kite experiment Silk handkerchief silk ribbon key a sharp piece of metal string kite condenser shed bad weather

Title:Experimenter’ name Purpose: Procedure: Results: Conclusion: the kite experiment report Homework :

Bye-bye!

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 blanksFill in the blanks.

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 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

 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.

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?

Things needed Functions Franklin’s Famous Kite Experiment a silk kite to last longer in bad weather to direct electricity towards the condenser a key bad weather to have lightning a 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

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?

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.

Life without electricity

Find the words that fit the descriptions c______ 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

1.conduct a number of experiments 2.attract lightning 3.do an experiment 4.wait for bad weather 5.a shed in the field 6.the experiment would not work 7.get charged 8.feel a light but very clear electric shock 9.collect and store a great deal of electricity 10.prove sth. 11.tear so soon 12.build the frame of the kite by making a small cross of two pieces of light wood 13.reach the corners of the handkerchief 14.tie…to 15.add…to 16.control the kite 17. fix …to 18.fasten…to 19. above the key 20. protect you from the electricity 21.appear to be coming on 22.under some cover 23.pull the electricity from the cloud

Step 2 ： Presentation As we all know, Benjamin Franklin is a famous politician ． But today, we will read a passage about him as a scientist. His serious attitude to science. Let’s see how Franklin made his famous electricity experiment by flying a kite ．