Unit-8-General-SciencePPT课件

1、2021/7/241Unit 8 General ScienceWork and Power2021/7/2422021/7/2432021/7/244Warming 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?2021/7/245Lead inLets look at the two p

2、ictures:What is the man doing?What is the woman doing?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?2021/7/246

3、Fast ReadingAnswer the following questions according to the 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?2021/7/247Language Pointsin everyday life

4、 在日常生活中prevent sb (from) doing 阻止某人做某事 eg. The heavy rain yesterday prevented us (from) coming.everyday: adj. “日常的，平常的”，作定语every day:every day:名词词组，名词词组，“每天每天” 作状作状语语2021/7/2483. In the direction of 沿着的方向 eg. She turned in the direction of the the park.4. That is to say. 也就是说 eg. He is a good studen

5、t; that is to say, he gets good grades in school.2021/7/2495. 数学符号在英语中的表达： “ = ” equal; be 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=32021/7/24106. In order to + V原 “为了，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 width2021/7/24118. apply to 把施加到/ 添到 apply for 申请9. as: “当的时候”，引导时间状语从句，与相近，强调两个动作同时发生，或某事一发生，另一事立即发生。 eg. As she sang, the tears ran down her checks.10. Work out: “算出，解出”11. Be measured in: 以单位计算”2021/7/2412Pr