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Work and Power
Warming Up
Answer the following three questions.
1. Do you know how to read “3+4=7” in English?
2. Can you explain Ohm’s Law in English?
3. Are you interested in books on science in English?
Lead in
Let’s look at the two pictures:
What is the man doing?
What is the woman doing?
If a force of N causes the weights to move 2 meters, how can you calculate the work done by the man?
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 Reading
Answer 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?
Language Points
in everyday life 在平常生活中
prevent sb (from) doing 制止某人做某事
eg. The heavy rain yesterday prevented us (from) coming.
everyday: adj. “平常的，平常的”，作定语
every day:名词词组，“每天” 作状语
3. 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 student; that is to say, he gets good grades in school.
5. 数学符号在英语中的体现：
“ = ” 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=3
6. In order to + V原 “为了，以便” 表目的
eg. Let’s walk faster in order to keep warm.
Adj n.
high height
long length
strong strength
deep depth
wide width
8. 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，强调两个动作同步发生，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”
Practice
Reading Comprehension
Language Study