16 Unit Scientists at work

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

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

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.

( 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. …

A high speed maglev train

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

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

Franklin’s Famous Kite Experiment lightning

Benjamin Franklin 1706-1790

哲学家

政治家

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

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 .

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 ?

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

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

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

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

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

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!

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