Teaching design of two iron balls landing at the same time in the second volume of the fourth grade Chinese of People's Education Press

"Two Iron Balls Touching the Ground at the Same Time" is a short scientific story in the second volume of the fourth grade Chinese of People's Education Press. How should teachers design teaching? I have compiled the teaching design of the second volume of the fourth grade Chinese published by People's Education Press, in which two iron balls landed at the same time. I hope everyone will gain something in the reading process!

Teaching Design of "Two Iron Balls Touching the Ground at the Same Time", the fourth grade Chinese volume of People's Education Press, 1

First, create a situation and have a deep conversation.

A word from Aristotle.

1, there is a saying that has never been doubted for thousands of years: Two iron balls, one weighing 10 lb and the other weighing 10 lb, fall from a height at the same time. Those who weigh 10 pounds must land first, and the speed is 0/0 times that of 10 pounds. ? The courseware gradually shows subtitles, and the students follow it. )

Who said this sentence? (blackboard writing: Aristotle's student profile: Aristotle was a Greek philosopher more than two thousand years ago)

For thousands of years, people regarded Aristotle's words as unchangeable truth, but one person doubted his words. He is Galileo. (writing on the blackboard: Galileo. Student introduction: Galileo was a great Italian scientist in the17th century. He became a professor of mathematics at the age of 25. )

Facing Aristotle's words, Galileo thought that two iron balls landed at the same time (blackboard writing topic)

This lesson lets us walk into this great story that has been passed down to this day again. Read the topic aloud.

Second, check the preview, the overall perception

1, one is a Greek philosopher more than two thousand years ago, and the other is a 25-year-old math professor. Who is right and who is wrong?

2. Overall perception. Don't worry, let's study what Aristotle said first.

Third, study the text, read and communicate.

(1) Read Aristotle's words and Galileo's questions carefully.

1, Aristotle's words appeared again: two iron balls, one weighing 10 pounds and the other weighing 10 pounds, fell from a height at the same time. Those who weigh 10 pounds must land first, and the speed is 0/0 times that of 10 pounds.

Read by name. What do you know? Understanding: the speed of falling is related to the weight. Write on the blackboard at any time

Teacher's guidance: Galileo is a great philosopher. He said that there is a problem with this sentence. Where is Galileo's question written in the text? Does he want to? Guide the students to find the relevant sentences and read them freely.

3. Multimedia demonstration of key sentences:

He thought: if this sentence is right, then tie two iron balls together, and the slow one will slow down the fast one, and the falling speed should be slower than the iron ball of 10 kg;

However, if the two iron balls tied together are regarded as a whole, their weight is 1 1 lb, and the falling speed should be faster than that of the iron ball with1lb.

In this way, two conclusions can be drawn from one fact. How do you explain this? Read by name. Listen and think:

In this question? A fact? What facts do you mean? What are the two different conclusions?

(1), communication after reading:

Have questions? A fact? Refers to what Aristotle said. Read that sentence together.

If Aristotle's words are correct, Galileo first put forward a hypothesis. According to this assumption, he came to two different conclusions, namely:

One is: tie two iron balls together, the slow one will slow down the fast one, and the falling speed will be slower than the iron ball of 10 kg.

One is that if two iron balls tied together are regarded as a whole, their weight is 1 1 pound, and the falling speed should be faster than that of 10 pound iron balls.

(2) Can you explain these two inferences in your own words?

Courseware demonstration: student description, teacher demonstration.

Conclusion: If Aristotle's words are correct, two conclusions may be drawn. Display courseware

In this way, two conclusions can be drawn from one fact. How do you explain this? What a mystery!

(3) You think Galileo is a scientist (good at thinking or reasoning or dare to doubt). Yes, his suspicion is based on assumptions and strict reasoning, not jumping to conclusions.

Galileo had such doubts about the words of the great philosopher, but what was people's attitude towards Aristotle's words at that time? Where did you know that? Read the second paragraph freely. Read and think: which words best reflect people's belief in Aristotle? Don't worry, find and draw.

(1) Guide and grasp: As the unchangeable words of truth, belief and blame, people engaged in scientific research, especially those who believe and worship Aristotle, have a profound understanding. Read aloud at any time.

Caption: Who is Aristotle in people's minds? Great philosopher, great authority, idol, God? If he says the earth is square, people will follow suit and say that the earth is square; If he says the earth is round, people will follow suit. Anyone who dares to doubt Aristotle will be blamed.

(2) Experience the role, read rhetorical questions, and read the reproachful tone. Timely evaluation.

? What do you mean? Is it necessary to go against human truth?

(3) Galileo doubted Aristotle and was accused. Is he afraid? Did you bow your head? Don't! Galileo still raised his own questions. After reading this, do you think Galileo is a- A scientist who dares to doubt and challenge authority.

Summary: Students grasp the key words, talk about their own understanding and read out their own experiences. They are really good at reading.

(4) Description: Do you know? At that time, in the sixteenth century, it was expensive to dare to challenge authority. The teacher supplemented the reading material Bruno.

(5) Guidance: Bruno paid the price of his life in pursuit of truth! Galileo did this in the social environment at that time, which would not only be criticized by people, but also punished, and even endanger his life. Is he afraid? You think Galileo is a scientist. Experience his courage to devote himself to science.

(2) Read the Galileo experiment and its results carefully.

1, guidance: Galileo was so good at thinking that he dared to challenge the great philosopher. Is the challenge over? No. But with what to prove his reasoning? Blackboard: Let's go and see his actual action!

Read four paragraphs silently and draw the sentences of Galileo's experiment with his favorite symbols.

(1) Show the sentences, fill in the blanks and understand the meaning. Catch it? Over and over again, many times, all, indeed, all the time? Experience these words.

(2) Comparison of word changes: use? Repeat? Change? Repeatedly? Is it okay? What's the difference between them?

(3) Imagine: Galileo repeated the experiment and did it differently every time. What might be different? (Different heights, different balls, different test sites, different weather, different wind conditions, etc. ) Galileo did many experiments repeatedly in this way.

What kind of scientist do you think Galileo is? (Or: What do you think of Galileo's attitude towards science? Then I feel the rigor of Galileo's scholarship and how persistent he is in his pursuit of science. Experience in guiding reading aloud.

After rigorous reasoning and repeated experiments, Galileo proved that Aristotle's sentence was wrong. He announced the results of the experiment to the students (the courseware showed the results and called the roll).

Students are named to play Galileo, and teachers and other students play Galileo's students for on-site oral communication.

A student who plays Galileo? Student? Announce the test results and the news that the leaning tower of Pisa will be publicly tested. Student? Or oppose, or discourage, or support cheers. In the interaction between the two sides, it is learned that the fundamental reason why Galileo insisted on public experiments is not only to prove Aristotle wrong, but more importantly, to make people not superstitious about authority and persistently pursue the truth. Teacher: Teacher, what's the purpose of your public experiments on people? )

This is the world-famous Leaning Tower of Pisa, Italy. Galileo, a young professor of mathematics, will do experiments here. As soon as the news spread, many people gathered around the leaning tower. Listen, people are talking under the tower. Courseware shows sentences and reads freely. What have you read about people's attitude towards him? Disdain, scoff, sneer, etc. ) catch the key words:? Bold? 、? Stubborn? Experience. Focus on guiding students to read people's words blaming Galileo with voice and body language.

3. Description: At this time, Galileo has come to people. Did Galileo give up after hearing people's severe criticism? Did he flinch? He once said:

Courseware presentation: It takes special courage to pursue scientific truth!

He said so, and even did so. You see, amid people's dissatisfaction and condemnation, Mr. Galileo has stood at the top of the leaning tower, and he will conduct public experiments on the leaning tower of Pisa. Guide the students to read the sentences of Galileo's experiment.

(1) Read aloud by roll call: Galileo appeared on the top of the leaning tower. He holds a 1 lb iron ball in his right hand and a1lb iron ball in his left hand. Two iron balls were released at the same time and fell from the air.

(2) Do you want to see the situation at that time? At this moment, we are standing under the leaning tower of Pisa, looking up, and the students are reading and demonstrating courseware.

(3) Imagine: What will people do when they see two iron balls landing at the same time?

Use? Galileo walked down the leaning tower, and people. The person who laughed at him just now said: the scientific researcher who believes in Aristotle said: the student who once discouraged Galileo from conducting public experiments said. ? Tell me about the scene at that time. What you said is wonderful. If you write it after class, it must be an excellent essay! )

(4) Summary: Galileo proved through his own repeated experiments and this open experiment that two iron balls with different weights fell from a height at the same time and always landed at the same time. Cardboard drawings and characters

4. Introduction: Facts have proved that great philosophers like Aristotle are not all right.

Read the name out loud.

Thinking: What did this sentence inspire you? Or do you understand something? Students discuss.

For example, we should respect knowledgeable people, but don't be superstitious about them; No one is perfect, and there will be mistakes; It is foolish to blindly believe and worship anyone. Like Galileo?

The blackboard says: Dare to doubt and pursue the truth before reading this sentence together.

Students, we should not only dare to doubt the great philosophers, but also dare to doubt the words of celebrities, books, parents, teachers and so on. Speak with reality. (It depends on time) We should not only doubt, but also try our best to practice.

Fourth, summarize the full text and sublimate emotions.

1, Galileo doubted Aristotle's words, which made people understand that not all great philosophers are right, and even more made people understand that we should dare to doubt and pursue truth when dealing with science. Because of this, Galileo became a great scientist and was called the father of modern science!

2. Additional famous sayings: In fact, many scientific innovations and inventions were born in the criticism of authority. Therefore, the teacher should recommend a good book to the students, called Five Thousand Years on Earth. After reading this book, you will meet more great people and gain more! Finally, I gave the students a sentence from Grandpa Li Siguang, a famous geologist in China. Let's encourage each other! Teachers and students read * * *.

You can't see the truth without doubt, so I very much hope that everyone will be skeptical and not be carried away by the completed theory. ? Li Siguang

Teaching Design of "Two Iron Balls Touching the Ground at the Same Time" in the Second Volume of Chinese for Grade Two and Four of People's Education Press

Learning objectives:

Know three new words and write 12 new words to guide students to understand according to the context? Professor, faith, stubbornness, audacity? The meaning of keywords, such as.

2. Read the text with emotion and guide the tone of the characters in the text.

3. Learn how to express the character's quality through typical examples and profile description.

4. From Galileo, let children realize the excellent qualities of being good at thinking, pursuing truth and being brave and fearless.

Teaching emphasis: The goal is 1, and the excellent qualities of Galileo are summarized from the article.

Teaching difficulties: the introduction of characters' tones and the writing of inspiration.

Teacher's preparation: make a more intuitive courseware that can reflect the content of the text.

Student preparation: Collect some information about Galileo and Aristotle, and prepare for communication in class.

Process design:

First, the story navigation, stimulate interest

1. Explain a joke story "Sticking to Temple Rules" before class. After listening, let the children talk about their feelings.

2. Introduction: Today we are going to approach two foreign grandfathers, an Italian scientist named Galileo. If he were still alive, he would be 45 1 year old. The other is the ancient Greek philosopher Aristotle. If he were still alive, he would be over 2400 years old. Do you want to know these two old birthday girls? What kind of story will happen between them after more than two thousand years? Look at the screen 1 Leaning Tower of Pisa City. When you see this tower, you will understand that Galileo did a great experiment to find out where two iron balls landed. Please look at the text and write it on the blackboard. Two iron balls-touchdown?

Second, it is difficult to hunt new things when you walk into the text.

1, a preliminary understanding of the characters: two great men are shown on screens 2 and 3, with simple conversations and blackboard writing (Galileo, Aristotle) for children to exchange information and learn from each other.

2, check the new words, guide writing: A name reading screen 5, 6, B read together and form the word C Pay attention to similar characters? Distinguish, argue, braid? Difference, in Mandarin? One point must be distinguished, and there is nothing to argue about in the middle, so why not weave a stranded wire? D directs writing. Violation? Change the word to radical, wai, Wei, Wei? Say it. ? Fake? A little more, how about it? Keep? Don't write less Tian Zige will demonstrate writing. Children can practice writing in class notes. Read screen 7 and understand the meaning in combination with the text. Profession, flattery, audacity, etc. And explained in the article.

Third, read the text again and ask questions skillfully.

1. Read the first paragraph together and ask: What kind of person can Galileo be seen here? Screen 10, 1 1 (blackboard writing is good at thinking)

2. At that time, who had higher prestige in people's minds? More famous? Who is better than who? Take a look, read and say, how can you tell in a few words (all, believe, can't be changed)

What did Aristotle say to make Galileo wonder? Screen 12

What did Galileo think? What is his thinking process? He questioned what he was pursuing. What kind of scientists can you see from it? Screen 13,14 (10+1<10 opposite conclusion 10 > 10) (read the third paragraph).

Discussion: What did Galileo do to prove that his idea was correct? Can you see his attitude towards scientific research? (writing on the blackboard: pursuing truth) which words can be seen best in the fourth paragraph? Repeatedly, always, only? wait for

E what did others say when Galileo was completely ready to challenge the authority Aristotle? Look for it and read it with emotion. What do they think? Let the children speak freely. How did Galileo do it? What did the facts prove? Screen 15, 16, 17, 18.

Fourth, summarize the full text and extend the writing practice.

What kind of scientist was Galileo? Galileo's experiment was successful. What will people say (language, expression)? Write it on paper and exchange it.

Five, blackboard writing:

Teaching design of "two iron balls landing at the same time" in the second volume of Chinese for the fourth grade of People's Education Press 3

Knowledge and ability: learn the new words and phrases in this lesson and understand how Galileo proved Aristotle's life unreliable with practice.

Learning process and method: Fill in the blanks on the basis of self-study and understand words, phrases and sentences.

Emotion and attitude: Learn from Galileo's scientific spirit of independent thinking, daring to break superstition, respecting practice and scientific attitude of serious research.

[Key and Difficult Points]

Point: I can understand how Galileo proved Aristotle's work unreliable through practice.

Difficulties:

Understand the meaning of two conclusions deduced by Galileo.

[Teaching hours] Two hours.

first kind

First, the teaching objectives

1. Learn new words and phrases.

2. Divide the text into paragraphs and tell the meaning of each paragraph and the main content of the text.

Second, the teaching AIDS prepare pictures.

Third, the teaching process

(a) discipline and caution

1. Introduce the dialogue: show the topic and ask questions.

2. Touching (zhu6) means landing.

(B) began to read the text to understand the situation of self-study.

1. Ask one student to read the text aloud, while others read silently, thinking while reading: What kind of experiment did Galileo do? What is the final test result?

2. Correct pronunciation according to students' reading aloud. Pay attention to remind (Zhu? (gēng).

3. According to the thinking questions put forward, check whether the students can understand the general content of the text after reading.

(Galileo 65438+the great Italian scientist of the 7th century. He made a public experiment on the leaning tower of Pisa. He dropped an iron ball weighing 10 lb and an iron ball weighing 1 lb from the top of the leaning tower at the same time, and two iron balls with different sizes landed at the same time.

(3) Read the first and second paragraphs of the text.

1. What is the first reading? Natural paragraphs, thinking:

What does this paragraph say? Galileo was called a debater.

2. Read the second paragraph and think:

( 1)? Believe it? What do you mean? Where do people believe in Aristotle? Find out the relevant sentences and read them. Believe and do it. ? People take his words as truth? Is it necessary to go against human truth? )

(2) From here, we can see how much people believe in stoddard. (degree of blindness)

(3) in this passage, Not allowed, not changed, not accused, not violated? How to understand these words?

(4) Summary: These words concentrated on people's absolute belief in Aristotle at that time, reaching a level of blind belief, which is a superstition. This superstition is in sharp contrast with Galileo's scientific attitude of questioning, and with Galileo's scientific spirit and courage of questioning Aristotle's words.

Blackboard design

Two iron balls landed at the same time.

Galileo suspicion analysis test

(5) homework.