WHAT YOU’LL NEED: ● Soap ● Water ● Your hands! WHAT TO DO: 1. Make sure your hands are dry. 2. Rub your hands together until you feel the heat of your hands. 3. Now, use soap and water to get your hands very slippery (滑的). 4. Try to make friction happen while your hands are slippery. 5. Please write down what has happened. LET’S TALK! Friction is an energy that happens when two things rub together. When friction happens, it makes heat! When your hands are slippery, they won’t make very much friction and your hands won’t get so hot. DID YOU KNOW? 1. Friction happens when you stop your fast running bike. 2. Ancient people made fires by rubbing two pieces of wood together. Friction happened though they didn’t know it. ? Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not too hot, touch the tires (輪胎) of the car before and after a short drive to see how much warmer they get from friction. |
A.slippery | B.dry | C.wet | D.smooth |
A.摩擦 | B.冷卻 | C.膨脹 | D.震動 |
A.Bike riding | B.Car driving | C.Hands rubbing | D.Friction discovering |
A.THINK IT OVER! | B.WHAT HAPPENED? |
C.EVERYDAY ACTION: | D.WORK WITH PARENTS! |
A.a(chǎn) science report | B.a(chǎn) car advertisement |
C.a(chǎn) rubbing introduction | D.a(chǎn) chemistry programme |
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科目:初中英語 來源:2010-2011學年江蘇省鎮(zhèn)江市初三上學期期末考試英語卷 題型:其他題
根據(jù)短文內(nèi)容及所給首字母提示寫出所缺單詞, 并將完整單詞填在下面對應題號后的橫線上。
Air is very important to everything that lives. But the air we breathe is g 1 dirty. People all over the world are looking for w 2 to make it clean again.
Have you e 3 watched the smoke from chimneys(煙囪) rising high in the air? Have you s 4 the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g 5 to breathe. If we want to keep healthy and strong, we need to breathe c 6 air.
W 7 more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p 8 .
Scientists have a 9 taken actions to stop or slow down some of the things that make the air dirty. They will not stop working u 10 we have clean air again.
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.
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A: Have you e_80___ been to Tokyo?
B: No, I have n___81__ been there before. But this summer I will go there with my parents.
A: I am s__82__ you will like it. My uncle u__83___ to work in Tokyo. But now he has g__84___to Paris for an i___85___ meeting. He will give a talk about how to p____86___ whales next week.
B: Paris? That is a really wonderful city with a very b__87_______ view.
A: R___88____? H__89___ I wish I could go there!
80____________81_____________82______________83______________84_____________
85____________86______________87_____________88______________89_____________
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