Unit8GeneralScience

1、Unit 8 General ScienceWork and PowerWarming UpAnswer the following three questions.1. Do you know how to read “3+4=7” in English?2. Can you explain Ohms Law in English?3. Are you interested in books on science in English?Lead inLets look at the two pictures:What is the man doing?What is the woman do

2、ing?If a force of 2000N causes the weights to move 2 meters, how can you calculate the work done by the man?1.If a force of 80N can make the lawnmower move along straight line for a distance of 40 meters, what is the work done by the woman?Fast ReadingAnswer the following questions according to the

3、text.1. What is the definition of “work”?2. How do you calculate the amount of work done?3. What is the definition of 1 Joule?4. What is the definition of “power”?5. What is the definition of 1 watt?Language Pointsin everyday life 在日常生活中prevent sb (from) doing 阻止某人做某事 eg. The heavy rain yesterday pr

4、evented us (from) coming.everyday: adj. “日常的，平常的”，作定語(yǔ)every day:every day:名詞詞組，名詞詞組，“每天每天” 作狀作狀語(yǔ)語(yǔ)3. In the direction of 沿著的方向 eg. She turned in the direction of the the park.4. That is to say. 也就是說(shuō) eg. He is a good student; that is to say, he gets good grades in school.5. 數(shù)學(xué)符號(hào)在英語(yǔ)中的表達(dá)： “ = ” equal; be

5、 equal to; is; make “ ” times; multiplied by “ ” divided by “ + ” plus; and; add “ ” minus eg. 3*5=15 2+4=6 17-5=12 9/3=36. In order to + V原 “為了，以便” 表目的 eg. Lets walk faster in order to keep warm.Adj n. high height long length strong strength deep depth wide width8. apply to 把施加到/ 添到 apply for 申請(qǐng)9. as: “當(dāng)?shù)臅r(shí)候”，引導(dǎo)時(shí)間狀語(yǔ)從句，與相近，強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)發(fā)生，或某事一發(fā)生，另一事立即發(fā)生。 eg. As she sang, the tears ran down her checks.10. Work out: “算出，解出”11. Be measure