1. 16
Unit
Scientists at work

2. physics biology chemistry
science
power
physics
electricity
cell
biology
germ
force
gravity
living things
gas
chemistry
change
liquid
solid
flame

3. do an experiment try out new ideas prove something / some ideas
invent new things
discover new things
learn more about…
Have you ever done an experiment?
Where did you do it?
What did your teacher remind you
before you do the experiment?
when
after

4. Follow the teachers’ instructions.
1. What is the most important thing students should remember?
2.What is the first thing students should do when they come into the lab?
3.Why should students be careful smelling from bottles?
4.What is to be done when anything gets into your eyes?
5.What should students do before leaving the lab?
Safety comes first!
Follow the teachers’ instructions.
Bottles may contain dangerous gases.
Immediately wash your eyes with a lot of water.
Clear everything away and leave the classroom neat and clean.
Wash your hands with water and soap.
Turn off the lights and shut the windows.

5. ( physics lab / chemistry lab / biology lab)
Rules for a lab
( physics lab / chemistry lab / biology lab)
Example:
1. Safety comes first!
2. Follow the teachers when you enter the lab. 3. 4. 5. 6. 7. …

6. A high speed maglev train

7. inventions advantages disadvantages Maglev It’s fast and clean
it doesn’t make
any noise.
It’s too expensive.
A waste of money.

8. It is good for the economy. It can help many people in the future.
It is clean and does not pollute the air.
It is important for science.
It brings people more comfort. …
Advantages
It is too expensive.
It is dangerous or bad for your health.
It is bad for the environment.
It is unnecessary.
Some people will use it for other things. …
Disadvantages

9. Franklin’s Famous Kite Experiment
lightning

10. Benjamin Franklin

15. 哲学家

17. 政治家

18. 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.
7.You can feel clear electric shock if you touch the string
with your fingers after the kite is flying in the sky.
8.Franklin’s experiment proves that lightning and
electricity are the same. T F F T F F F T

19. Purpose Materials Results
Franklin’s Famous Kite Experiment
Purpose
Materials
Results
to show that lightning and electricity are the same .
silk handkerchief, wooden sticks , a string , a sharp piece of metal , a key , a silk ribbon ,a condenser , a small shed , a thunderstorm with lightning
The electricity stored in the condenser can be used to do other experiments , which proves that lightning and electricity are the same .

20. 1.Why did Franklin conduct the kite experiment?
Read carefully and answer the following questions:
1.Why did Franklin conduct the kite experiment?
2.What was the weather like when Franklin did his
kite experiment?
3.What was the result of Franklin’s kite experiment?
4.What can the dry silk ribbon do?
5.Where should we stand if we do the kite experiment?
6.What do we need to do the kite experiment ?

22. a kite things we need bad weather( thunderstorm) a shed a condenser
a key
things we need

23. What do we need to make the kite?
How to make Franklin’s kite?
a sharp piece of metal
5.fix a sharp piece of metal
to the top of the longer stick
two pieces of light wood
1.build the frame
by making a small cross
a handkerchief
2.tie the corners
to the points of the cross
4.tie a long string
to the cross
strings
3.add a tail to the frame
a silk ribbon
7.tie a silk ribbon
to the string above the key
6.fasten a key
to the end of the long string
a key

24. a key a silk kite bad weather a condenser a shed
Franklin’s Famous Kite Experiment
Things needed
Functions
to attract lightning , to last longer in bad weather.
a silk kite
a key
to direct electricity
forwards the condenser
bad weather
No bad weather,no lightning.
a condenser
to store electricity
to keep himself and his tools dry so that he himself would not be hit by the lightning
a shed

25. a string wooden sticks a sharp piece of metal a silk ribbon
Franklin’s Famous Kite Experiment
Things needed
Functions
To build the frame of the kite by making a small cross
wooden sticks
a string
to control the kite by tying a long string to the cross
a sharp piece of metal
to pull the electricity from the thundercloud
to protect you from the
electricity
a silk ribbon

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

27. Enjoy science! What do you think of Benjamin Franklin?
What can you learn from him?
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!
Enjoy science!

28. 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