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Unit 18  Scientists at work2

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Unit 18  Scientists at work2


4.a condenser was used in the experiment to store electricity. t
5.the key tied to the string was put into the door to stop he kite from flying away.
6.franklin conducted the kite experiment in sunny days.
read he passage and then find out the main idea.
paragraph 1 introduction of franklin’s experiment.
paragraph 2—3 the process of the experiment.
paragraph 4—6 the tip of doing the experiment.
aim: to show that lightning and electricity are the same.
materials: some wooden sticks, a piece of silk, some rope, a very sharp piece of metal, a silk ribbon, a key, a condenser, a small shed, a thunderstorm with lightning.
instructions: paragraphs 5 and 6. description: paragraph 3.
results: the electricity stored in the condenser can be used to do other experiments, which proves that lightning and electric¬ity are the same.
discussion: none.
step 4 listening to the reading passage
play the tape for the students to listen and follow. pay attention to the pro- nunciation and intonation.
step 5 post-reading
answers to exercise 1:1 true 2 false 3 false 4 true 5 false
suggested answers to exercise 2:
1 he wanted to prove that lightning and electricity are the same thing.
2 a silk kite will last longer in bad weather than a pa¬per kite.
3 yes. franklin\'s experiment was very dangerous be¬ cause if something went wrong he could be killed by the lightning.
answers to exercise 3:1 incorrect 2 correct 3 incorrect 4 correct
extension 1 franklin said, \'you can collect and store the electricity with the condenser and use it for other experiments.\' ask students what other kinds of simple experiments could be done using the electricity stored in the condenser. benjamin franklin conducted many experiments in his life. you might want your ss to go on the internet to find out what they were and report back to the class. \'
step 6 summary
the purpose of the experiment to show the lighting and electricity are the same:
time:: june 1752 people: franklin, his son place: a shed in the fields
weather: thunderstorm, rainy day
four things needed for the experiment: a strong kite, a key, bad weather, a condenser
three important steps to prepare for the experiment: fix, fasten, tie
step 7 homework:
1.introduce a scientist hay you admire most。
2.finish winners period 2

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