Unit 5 Look into Science lessons 25-26 课件(共41张PPT)

(共41张PPT)
冀教版·九年级全册
Lesson 25
Unit 5 Look into Science
学习目标
objectives
The new words: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude
To understand the theory of the experiment.
To learn actively.
Words
experiment
jar
upside
pour
correct
scientific
n. 实验；试验
n. 广口瓶；罐子
n. 上部；上边
v. 倒出；倾倒
adj. 正确的；恰当的
adj. 科学的
Words
method
raincoat
force
pressure
conclude
n. 方法；办法
n. 雨衣
n. 力量
v. 迫使；强迫
n. 压力；压强；挤压
v. 得出结论；推断出
Lead in
Discuss
Do you like to do experiments
What experiments have you done
Listen and answer the following questions.
1.What’s Danny’s theory
2.What’s Jenny’s theory
Danny thinks the floor will get wet.
Jenny thinks the water will stay in the jar.
Pre-reading
While-reading
Read the lesson and answer the questions.
1.Where does Danny think they should do the experiment
2.What keeps the water in the jar
3. Is Jenny sure of her theory How do you know
He thinks they should do it outside.
The force of the air.
Yes, she is. She thinks that Brian can do the experiment over Danny’s head.
4. Why does Danny put on his raincoat
5. What does Danny conclude
He thinks the water will pour out.
The air is stronger than he thought.
I fill a jar with water.
我用水把瓶子装满。
fill …with…用…装满……
He has filled his case with many books.
他已经把书装满了箱子。
cover…with… 用……盖住……
Language Points
2. I turn the jar upside down.
我把广口瓶倒置。
upside down “向下翻转过来”。
You hold the book upside down.
你把书拿倒了。
right side up “正面朝上”
be sure +that 从句表示“认为…一定…”
而be not sure 表示不确定.
eg. I’m sure she will come here.
我确信她会来。
I’m not sure when he’ll come here.
我不能肯定什么时候来这儿。
I’m sure the floor won’t get wet.
我确信地板不会湿。
4. We’ll do the experiment and observed what will happen.
我们将做这个实验并观察会发生什么情况。
observed 动词, “观察”。
observe sb. do/ doing sth.
eg. I observed her dance.
When I passed by the grass, I observed him
walking.
Fill in the blank with the proper word. The first letter is given.
1. Let’s do the e and see what
happens.
2. A “t ” is an idea and predicts what
will happen.
3. We can p who’s right.
4. Turn the jar u down and we can see
what will happen.
5. “O ” is another way of saying
“watch carefully”.
xperiment
heory
rove
pside
bserve
Let’s do an interesting experiment. First, I ____ a jar _____a desk, ____it _____ water, then _____the top ____ a piece of cardboard. When I ____the jar ______ _______, can you guess what will happen
put
on
fill
with
cover
with
turn
upside
down
How do we do the experiment
Post-reading
Let’s Do It !
In a small group, try the experiment above. Try it with the jar full. Try it again with the jar nearly empty. Write down your observations.
Did the experiment work
Did anyone get wet
A balloon is full of air. If we pierce(刺破) it with a needle, it will break with a loud bang. But if we put a piece of glue on the balloon and do the same experiment, what will happen
Surprisingly, we won’t hear the same sound. The balloon will become smaller and smaller. We will feel that the air is running out slowly through the pinhole(针孔). We know the balloon is made of
An Experiment about a Balloon
rubber(橡胶). When the balloon is pierced, the air
leaving the balloon forms a kind of force. Rubber is
so thin that it can’t support(支撑) such force. So
the balloon breaks quickly with a loud bang. But
the glue is different. It’s strong enough to support
the force of the air.
People have learned something from this
experiment. They have used this
method to make tires(轮胎).
An Experiment about a Balloon
I. 根据汉语或首字母提示，完成下列句子。
1. It is the best ________ (方法) of working out the math problem.
2. Have you heard of the ________ (理论）before
3. My daughter likes _________ (科学) more than English.
4. Your answer is wrong, and we can do an experiment to p_____ it.
5. Don’t turn the bottle u______ down. It’s too dangerous.
pside
method
theory
science
rove
Practice
1. He locked the door ________ (careful) before he left.
2. Let’s ______ (finish) the work together now.
3. Can you guess what __________ (happen) in 100 years
4. What's another way of _______ (say) “autumn”
saying
II. 用所给单词的适当形式填空。
carefully
finish
will happen
1. 我确信你是一个诚实的人。
I ______ ______ that you are an honest man.
2. 请用一块玻璃盖上那个杯子。
Please ______ the cup _____ a piece of glass.
3. 小心，否则你会弄湿的。
Be careful, or you’ll ______ ______.
4. 把箱子倒过来，你会找到标签的。
______ the box _______ _______, then you’ll find the label.
III. 根据所给汉语意思翻译下列句子。
am sure
cover with
get wet
Turn upside down
Lesson 26
holder n. 支托物
candle holder n. 蜡烛座
shallow adj. 浅的
light v. 点燃
lighter n. 打火机；点火器
match n. 火柴
burn v. 燃烧
examine v. 检查
oxygen n. 氧气
use up 用完
Words
match
burn
candle holder n.
Think about it
Do you think science is interesting Why or why not
Name one or two famous Chinese scientist. What do you know about them
Science is so interesting! I’m sure you’ll like this experiment!
What do you need
A candle
A candle holder
A big glass jar
A shallow dish with water
matches
While-reading
What do you do
1. Put the candle in the candle holder.
2. Put the candle holder on the dish.
3. Fill the dish half full of water.
4. Light the candle .
5. Let the candle burn for two or three minutes.
6. Carefully put the jar over the candle until the top of the jar rests on the dish .
7. Look at the water in the jar. What observation can you make
What is happening
As the candle burns, it uses up oxygen in the air. When the candle stops burning, it has used up all the oxygen in the air. The water inside the jar then rises. How far does the water rise There is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar.
Keep the candle burning! 让蜡烛燃烧！
keep sth. (sb.) doing, 使某物（某人）保持做某一动作。
eg. Don’t keep the water falling.
不要再让水继续流了。
She kept me holding the far with my hand. 她让我一直用手握住瓶子。
Language points
1. Do you think science is interesting
你认为自然有趣吗？
science 科学；scientist自然科学，科学家
eg. Wang Peng loves science very much. He wants to be a scientist.
王鹏非常喜欢科学。他想成为一名科学家。
2. a shallow dish with water一个装水的浅盘
shallow adj. 浅的
反义词：deep深的
eg. Please pass me a shallow dish (plate).
请递给我一个浅盘子。
The idea of the passage is very shallow. I can understand it. 这篇短文的意思很浅显，我能读懂它。
① light v. 点燃，照亮
It’s time to light up.
该点灯了。
It’s cold in the room. Let’s light a fire.
房间里太冷了。咱们把火生起来吧。
3. light the candle 点亮蜡烛
= make the candle burn使蜡烛燃烧
② light n. 光，光线（不可数）；电灯（可数）
The moon light comes into the room through the
window.
月光透过窗子照进了房间。
Don’t forget to turn off the lights when you leave.
当你离开的时候不要忘了关灯。
③ light adj. 颜色浅的（反义词dark）；
（分量）轻的（反义词heavy）
Rose likes the light green skirt.
罗斯喜欢那件淡绿色的裙子。
The bag is very light. Mary can carry it easily.
那个包很轻。玛丽能轻易地把它搬起来。
4. Carefully put the jar over the candle.
小心地把瓶子倒扣在蜡烛上。
carefully adv. 仔细地，小心地
careful adj. 细心的，认真的
care v. 关心；在意
care(v.) + ful = careful (adj.)
careful ( adj. ) +ly = carefully (adv.)
Jenny is a careful girl. She does everything carefully. She often cares for others.
詹妮是一个认真的女孩。她做任何事情都非常仔细。她经常关心他人。
5. As the candle burns, it uses up oxygen in the air.
当蜡烛燃烧的时候，需要消耗空气中的氧气。
① as 在此为“当……的时候”。它有着多重意义。
Please do it again as I did.
请像我做的那样再做一遍。（像……一样）
As it is late, I have to leave now.
由于天太晚了，我得走了。（由于，因为）
You will find the building as you reach the end of
the street.
当你走到这条街那头，你就会看到那座大楼。
（当……时候）
② use up用光，耗尽。表示完全，彻底。
He was hungry and ate up the bread.
他饿了，把面包全吃光了。（eat up吃光）
Jim used up his money to buy the computer.
吉姆为了买电脑花光了所有的钱。
6. The water inside the jar then rises.
这时瓶子里的水就会上升。
rise v. 上升，升起（不及物）
The sun rises in the east.
太阳从东方升起。
The river is rising after the heavy rain.
大雨后河水上涨。
注意：raise“提高，升起”（及物）
Liu Fei raised her hand and asked a question.
刘菲举手问了一个问题。
7. There is about one fifth oxygen in the air, so the water rises and fills about one-fifth of the jar.
氧气在空气中占五分之一，所以水面上升并且占据了瓶子的五分之一。
*分数的表达：
分数 =
分子
分母
基数词
序数词
1
序数词
>1
序数词+s
eg. 1/3，one third
1/5, one fifth
3/4, three fourths
2/5, two fifths
1. The water here is s______, not deep.
2. Let the fire b______ for a few hours. The room will be very warm.
3. Look! The boy is playing with some ________ (火柴).
4. There is little ______ (氧气) at the top of the mountains.
5. Mr. Black sat down and __________ (点燃) a candle.
I. 根据首字母或汉语提示，完成下列句子。
lit/ lighted
hallow
urn
matches
oxygen
Practice
1. Please pass me the bottle full ______ water.
2. He is so hungry that he has eaten ______ all the food on the plate.
3. I usually put the candle ______ the candle holder.
4. Mr. Gao came into the classroom ______ a book in his hand.
5. The rainy day will last ______ three days.
II. 用适当的介词填空。
for
of
up
in
with
1. 当蜡烛停止燃烧时，它已用光了空气中所有的氧气。
When the candle _______ ________, it ____ ______ ______ all the oxygen in the air.
2. 我们班里五分之三是女生。
_____ _____ of the students in our class are girls.
3. 为了完成那项工作，他工作了十个小时。
____ _____ the work, he has worked ____ ten hours.
III. 根据汉语提示，翻译下列句子，每空一词。
stops burning
up
Three fifths
To finish for
has used
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