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新人教版高中英語必修2Unit 4 History and Traditions-Reading for Writing教案
Step 1 Lead inThere are many interest of places in the UK. What do you know ?The Big Ben the London Tower the Thames RiverStep 2 Before reading---analyze the titleBeautiful Ireland and its traditionWe know that the article mainly tells about the beauty and traditions of Ireland. Step 3 While reading---Task 1Read the text and answer the following questions.Q1: What makes the Irish countryside exciting and inspiring?Its beauty and how it offers something for all the scenes.Q2: What are the best ways to experience some Irish traditions and cultures?By stopping by a village pub and relaxing with a drink and traditional meal while listening to music and watching dancingQ3: What is the meaning of “breathe in the sweet scent of fresh flowers while birds greet the new day with their morning song ?”It means to not just smell but also breathe in the smell of fresh flowers early in the morning as the birds sing their first song of the new day.Q4: What are the best ways to experience Chinese traditions and customs ?By travelling to different places and using all your senses to experience everything and by interacting with local people.Step 4 While reading---Task 2Analyze the descriptive paragraph1. Identify and underline the paragraph’s introductory sentence and the ending sentence.Introductory sentence: Ireland’s beautiful countryside has always had a great influence on its people and traditions.Ending sentence: And if you introduce yourself to a friendly face, you are more than likely to experience local culture and customs first-hand.2. The paragraph talks about different senses in different places. Write the senses and places in the order that they appear.
新人教版高中英語必修2Unit 4 History and traditions教案
這個地區(qū)有著深厚的傳統(tǒng)。既學(xué)既練：為了讓更多的外國游客了解中國文化，欣賞中國美麗的自然風(fēng)光，感受中國發(fā)生的巨大變化，某外文雜志社將出版一本英語小冊子來介紹中國的旅游景點。該雜志社邀請你為該小冊子寫一篇英語短文來介紹杭州，內(nèi)容包括：1．杭州的位置(中國東南部)、面積(16 000多平方公里)及歷史(2 200多年)等；2．杭州的旅游特色(自然風(fēng)景、傳統(tǒng)文化、特色小吃等)；3．希望更多的游客來杭州參觀。注意：1．詞數(shù)80左右；2．可適當(dāng)增加細(xì)節(jié)，以使行文連貫。Located in the southeast of China, Hangzhou is a beautiful city．Dating back more than 2，200 years, Hangzhou covers an area of more than 16，000 square kilometers．In Hangzhou, you can visit the West Lake, whose scenery is fascinating．In addition, you can’t miss its cultural relics and historical sites, from which you will learn more about excellent Chinese traditional culture and traditions．In Hangzhou, the special snacks are famous and visitors from different parts of the world think highly of them．As a tourist attraction, Hangzhou attracts a large number of visitors from home and abroad every year．Once you come to China, Hangzhou is a scenic spot you can’t miss．
新人教版高中英語必修2Unit 5 Music-Discovering Useful Structures教案二
4. When he got absorbed in his world of music, he felt as if he could “see” the beauty of the world around him, like he had in his previous life.P·P as adverbial: _________________________________________________________________.Function: _______________________________________________________________________.Step 5 Solid Complete the passage with the words in brackets in their correct forms.Well known as a successful band, the Impact members show quite a few striking qualities. They never ever give up. When _____________(question) by the media, they are not _____________(discourage) and practise even harder. They are improving themselves by attending several master training class. They are united. _____________(fill with) team spirit, they act as a whole, always aiming for glory. Step 6 Difference and similarity from -ingObserve the following examples.1. He went out, shutting the door behind him.=He went out, ________________________________________________________.2. Not knowing what to do, he went to his parents for help.=__________________________________________, he went to his parents for help.Similarity: _______________________________________________________________________________________________________________________________________________________.Difference : _______________________________________________________________________________________________________________________________________________________.Step Practice1. ________ in a hurry, this article was not so good. 因為寫得匆忙, 這篇文章不是很好。2. ________ carefully, he found something he hadn’t known before. 他仔細(xì)讀書時, 發(fā)現(xiàn)了一些從前不知道的東西。3. ________ why he did it, the monitor said it was his duty. 當(dāng)被問及他為什么要這么做時, 班長說這是他的職責(zé)
新人教版高中英語必修2Unit 5 Music-Listening＆Speaking＆Talking教案
choir memberspeople to run food stands people to sell festival ticketspeople to sell music CDspeople to set up equipmentmusical performersStep 2: Listen to the announcement again and answer the questions. ? 1. What kind of songs will Grace Davis sing at the festival?? 2. Who can try out as a performer?? 3. What can those who think they do not have musical talent do?? 4. How can students volunteer to take part?? Talking about preferences:? Would you prefer doing ..?? What would you prefer to do?? Would you rather do .... or ….?? What would you rather do?? I'd prefer .... to ..? I'd rather have ... than .. Step 3: Speaking ProjectWork in groups. Role-play the conversation or make a new one.? Debbie: Where have you been? You missed the announcement about the music festival.? John: I was at the doctor's office. Music festival?? Frank: Yes, it's going to be next month on the school sports field. John, you can play the piano. How about playing it at the festival?? John: Well, I'd rather play the violin. I can play Liang Zhu.? Frank: Wow! Sounds good. What about you, Debbie? ? Debbie: Actually, I don't have much musical ability. I'd prefer just to help out with the crowds.? Frank: You can sell tickets or work at a food stand.? John: So can I assume that the aim of the festival is to raise money?? Debbie: Yes. All of the money will go to charity.
新人教版高中英語必修2Unit 5 Music-Listening and Speaking教案
This lesson is about music. Students can classify the types of music through the instruments and its sound and can talk about their preferences about music, even join some activities and play a role in them according to their musical talents. On the basis, they are guided to use the languages to express their preferences and some plosive sounds and their rules.1. Classify the music types through the instruments and its sound.2. Listen and understand what the speakers’ preferences are and the reasons; talk about their own preferences and give their own reasons, using these sentences: “What kind of music do you like? And why? “ “Because it makes/gives me energy/peaceful.../touches my heart...”.3. Learn some plosives and the rules.4. Join some activities and play a role in them according to the talents. 1. Listen and understand what the speakers’ preferences are and the reasons;2. talk about their own preferences and give their own reasons, using these sentences: “What kind of music do you like? And why? “ “Because it makes/gives me energy/peaceful.../touches my heart...”.3. Learn some plosives and incomplete plosives and its rules.Step 1 Lead inPoint at the pictures on P50 and ask Q1: What are the people doing in the pictures below?Q2: What kind of music they are?Then play the MP3s one by oneStep 2 ListeningTask 1: A reporter from the school newspaper is interviewing students about music. Listen to the interviews. Draw lines between the words to make complete sentences. Some words will not be used.
新人教版高中英語必修2Unit 5 Music-Reading and Thinking教案二
1. Get basic information about Eric; read deeply to understand the history and development of the virtual choir.2. Understand what the function of the virtual choir is and how to make a virtual choir.3. Understand the meaning of some languages in the context of the text through question guidance, such as “Many people do not have close friends or contacts who have the same interest in music.” and so on.Step 1 Leading-in1. Answer the following questions.Q1：Do you know the Apps like Tik Tok and Quick Hand?Q2: Do you want to make a Tik Tok video or a Quick Hand video?2. Play a Tik Tok video Step 2: Understanding the title Q1：What does the title mean ?Q2: Is the article a narration or exposition? Why? Q3: Can you change the title ? If you can, what is the title?Step 3: Scanning the whole text and getting the basic information1. Answer the following questions.Q1：Who came up with the idea for a virtual choir?Q2: Where did Eric studied the musical composition?Q3: What is his song?2. Find the main idea of each paragraph3. Deal with some new words.Step 4: Reading carefully to get detailed informationPara 1 How to make a virtual choir1. PreparationA. tools: a virtual camera; an Internet connectionB. hero/heroin: friends or some individuals who have the same interests2. Process
新人教版高中英語必修2Unit 5 Music-Reading for Writing教案二
The Internet celebrity Gao Yifeng. Years ago, he owned 5 companies and the staffs over 1,000, but during the economy crisis, he became nothing but debt. He was so worried that his hair became white overnight. There was a time when he wanted to killed himself. But after listening to the song Start Over by Liu Huan, he decided to cheer himself up. He started a steamed bun shop and gradually became a national chain shops. Now he became successful again.Walter Haddon said, “Music is the medicine of a troubled mind.” Music contains such a pleasant and inspiring force. Music gave him courage and bravery. When he listened to the song, it made his spirit fly like a kite in the wind. Music gave him strength and brought him relief. It was the rock I leant on to become strong and to get through those hard times. I hope none of us have to go through the same kind of suffering that he did. At the same time, we all go through various periods when we feel sad or alone. During those times, music can help us in the same way that it helped him. I hope we all will somehow begin to treasure music and make it a part of our life. Thank you for your listening !5.Revise your writing each other.Does he/she explain how music has changed his/her/someone else’s life?Are some of the rhetorical devices included and used properly ?Does he/she talk about how music makes him/her/someone feel?Is the first word in each sentences capitalised?Does he/she use correct punctuation ?
新人教版高中英語必修3Unit 2 Morals and Virtues教學(xué)設(shè)計二
Activity 41. Students complete the task of activity 4, then teachers and students check the answers. 2. The teacher organized the students to work together and asked them to use the tables and mind maps sorted out before to retold the important choices in Lin Qiaozhi's life and their resultsStep 5 Language points1. The teacher asks the students to read the text carefully, find out the core words and long and difficult sentences in the text and draw lines, understand the use of vocabulary, and analyze the structure of long and difficult sentences. 2. The teacher explains and summarizes the usage of core vocabulary and asks the students to take notes. 3. The teacher analyzes and explains the long and difficult sentences that the students don't understand, so that the students can understand them better. Step 6 Homework1. Read the text again, in-depth understanding of the text; 2. Master the use of core vocabulary and understand the long and difficult sentences. 3. Complete relevant exercises in the guide plan. 1、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生是否理解和掌握閱讀文本中的新詞匯的意義與用法；2、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否結(jié)合文本特點總結(jié)林巧稚的人生原則和人格品質(zhì)特征；3、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否針對人生抉擇發(fā)表自己的看法；能否全面地、客觀地、理性地看待問題，進(jìn)而對道德和人性有更加深入的思考和理解。
新人教版高中英語必修3Unit 2 Morals and Virtues教學(xué)設(shè)計三
The joke set her crying.這個玩笑使她哭起來。Step 5 ReadingActivity 31. Students read the small text in activity 3. The teacher provides several small questions to check whether students understand the content of the text and the ideographic function of the -ing form in the text.*Where are those people?*Why did Dr Bethune come to China?*How did he help the Chinese people during the war?*What did Chairman Mao Zedong say about him?2. Ss try to rewrite some sentences using the -ing form. Then check the answers. When checking the answers, the teacher can ask different students to read the rewritten sentences and give comments.Answers:1. he became very interested in medicine, deciding to become a doctor.2. …after hearing that many people were dying in the war.3. Helping to organise hospitals, he taught doctors and nurses, and showed people how to give first aid./ He helped to organise hospitals, teaching doctors and nurses, and showing people how to give first aid.4. …praising Dr Bethune as a hero to be remembered in China.Step 6 PracticeActivity 4Students complete grammar activities 2 and 3 on page 69 of the workbook.Step 6 Homework1. Understand and master the functions and usage of the -ing form;2. Finish the other exercises in Using structures.1、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生是否理解和掌握動詞-ing形式作賓語補(bǔ)足語語和狀語語的功能和意義；2、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否正確使用動詞-ing形式描述人物的行為、動作及其經(jīng)歷；3、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否獨立完成練習(xí)冊和導(dǎo)學(xué)案中的相關(guān)練習(xí)。
新人教版高中英語必修3Unit 2 Morals and Virtues教學(xué)設(shè)計四
3.Teachers ask different groups to report the answers to the questions and ask them to try different sentence patterns.The teacher added some sentence patterns for students to refer to when writing.Step 4 Writing taskActivity 51.Write the first draft.Students first review the evaluation criteria in activity 5, and then independently complete the draft according to the outline of activity 4, the answers to the questions listed in the group discussion and report, and the reference sentence pattern.2.Change partners.The teacher guides the students to evaluate their partner's composition according to the checklist of activity 5 and proposes Suggestions for modification.3.Finalize the draft.Based on the peer evaluation, students revise their own compositions and determine the final draft.Finally, through group recommendation, the teacher selects excellent compositions for projection display or reading aloud in class, and gives comments and Suggestions.Step 5 Showing writingActivity 5T call some Ss to share their writing.Step 6 Homework1. Read the passage in this section to better understand the passage.2. Carefully understand the hierarchical structure of the article, and deeply understand the plot of the story according to the causes, process and results;3. Independently complete the relevant exercises in the guide plan.1、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生是否理解和掌握閱讀文本中的新詞匯的意義與用法；2、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否通過人物言行的對比分析道德故事的深層內(nèi)涵；3、通過本節(jié)內(nèi)容學(xué)習(xí)，學(xué)生能否根據(jù)故事的起因、經(jīng)過和結(jié)果來深入理解故事的情節(jié)，從而了解文章的層次結(jié)構(gòu)；4、結(jié)合現(xiàn)實生活案例發(fā)表自己的見解和看法,寫一篇觀點明確、層次分明的故事評論。
新人教版高中英語必修3Unit 3 Diverse Cultures教學(xué)設(shè)計一
Activity 81.Grasp the main idea of the listening.Listen to the tape and answer the following questions:Who are the two speakers in the listening? What is their relationship?What is the main idea of the first part of the listening? How about the second part?2.Complete the passage.Ask the students to quickly review the summaries of the two listening materials in activity 2. Then play the recording for the second time.Ask them to complete the passage and fill in the blanks.3.Play the recording again and ask the students to use the structure diagram to comb the information structure in the listening.(While listening, take notes. Capture key information quickly and accurately.)Step 8 Talking Activity 91.Focus on the listening text.Listen to the students and listen to the tape. Let them understand the attitudes of Wu Yue and Justin in the conversation.How does Wu Yue feel about Chinese minority cultures?What does Justin think of the Miao and Dong cultures?How do you know that?2.learn functional items that express concerns.Ask students to focus on the expressions listed in activity. 3.And try to analyze the meaning they convey, including praise (Super!).Agree (Exactly!)"(You're kidding.!)Tell me more about it. Tell me more about it.For example, "Yeah Sure." "Definitely!" "Certainly!" "No kidding!" "No wonder!" and so on.4.Ask the students to have conversations in small groups, acting as Jsim and his friends.Justin shares his travels in Guizhou with friends and his thoughts;Justin's friends should give appropriate feedback, express their interest in relevant information, and ask for information when necessary.In order to enrich the dialogue, teachers can expand and supplement the introduction of Miao, dong, Lusheng and Dong Dage.After the group practice, the teacher can choose several groups of students to show, and let the rest of the students listen carefully, after listening to the best performance of the group, and give at least two reasons.
大班科學(xué)教案：白天先生與黑夜小姐
活動準(zhǔn)備：1、地球儀、手電筒各一個。2、白色和黑色卡紙制成的“白天先生”和“黑夜小姐”人手一個。3、 32K大小的黑卡紙每人一張、筆。 活動環(huán)節(jié)： 一、念詩歌《我喜歡長長的夜》。（1）教師引導(dǎo)語：前幾天諸老師和我們一起學(xué)習(xí)了一首好聽的詩歌，叫什么呢？你們覺得這首詩歌聽起來怎么樣？（2）幼兒用溫馨好聽的聲音來把詩歌念一遍。
人教版高中歷史必修2第一次工業(yè)革命教案2篇
一、教學(xué)目標(biāo)知識與能力：了解或掌握英國工業(yè)革命的條件和重要發(fā)明及進(jìn)程，掌握工業(yè)革命的影響。分析工業(yè)革命首先發(fā)生在英國的條件和工業(yè)革命的影響，領(lǐng)會生產(chǎn)力和生產(chǎn)關(guān)系，經(jīng)濟(jì)基礎(chǔ)和上層建筑之間的辯證關(guān)系；分析工業(yè)革命對世界市場發(fā)展的影響，提高材料解析能力；分析世界市場基本形成的影響，培養(yǎng)學(xué)生運用辯證唯物主義和歷史唯物主義分析歷史事件的能力。過程與方法：啟發(fā)式談話法，問題探究法：層層設(shè)疑，環(huán)環(huán)相扣，由淺入深地理解知識。聯(lián)系比較法：構(gòu)建知識體系，突出事物特點。情感態(tài)度與價值觀：懂得科學(xué)技術(shù)是第一生產(chǎn)力，使學(xué)生尊重科學(xué),熱愛科學(xué)；正確認(rèn)識工業(yè)文明的成就與代價，幫助學(xué)生形成正確價值觀；聯(lián)系中國歷史深刻理解科技興國，深化改革的必要性。二、教學(xué)重點和難點重點：英國工業(yè)革命產(chǎn)生的原因、工業(yè)革命的主要成就和影響。難點：工業(yè)革命對資本主義世界市場發(fā)展的影響。課時安排：1課時教具準(zhǔn)備： 多媒體課件以及相應(yīng)教學(xué)資料。
人教版高中政治必修3在文化生活中選擇教案2篇
（二）“奧運福娃”探究1、“五福娃”體現(xiàn)了哪些精神？體現(xiàn)了“科技奧運、人文奧運和綠色奧運”的奧運精神也體現(xiàn)了“團(tuán)結(jié)、奮進(jìn)、愛好和平”的民族精神。2、“龍”是中華民族的圖騰，我們自稱是龍的傳人，但北京奧運吉祥物里為什么沒有“龍”？“龍”（dragon）在我國是美好的意思，例如龍鳳呈祥，但在西方是魔鬼,很恐怖。北京奧運不僅是中國的奧運，更是世界的奧運，因此，福娃的原形中沒有龍，這就是文化選擇的結(jié)果。（三）感受先進(jìn)文化1、交流自己最喜愛的文化。2、觀看《千手觀音》，談觀后感。（四）陽光下有陰影1、小品《電腦算命》2、課堂辯論正方：“燒香敬神”是封建迷信活動，不可取反方：“燒香敬神”是精神信仰活動，可取3、提高眼力，拒絕污染了解現(xiàn)實生活中的落后文化、腐朽文化，自覺抵制社會中落后文化、腐朽文化的毒害。
人教版新課標(biāo)高中物理必修1自由落體運動教案2篇
教學(xué)重點1．自由落體運動的概念及探究自由落體運動的過程。2．掌握自由落體運動規(guī)律，并能運用其解決實際問題。教學(xué)難點演示實驗和探究實驗的技巧及自由落體運動規(guī)律的得出.教學(xué)過程設(shè)計思想：1、 先用游戲激發(fā)學(xué)生學(xué)習(xí)興趣，順理成章地研究落體運動；2、 通過演示實驗讓學(xué)生自己總結(jié)出物體下落快慢不同的主要原因是空氣阻力，從而猜想若沒有空氣阻力會怎樣；3、 用牛頓管實驗驗證猜想，引入了新的理想運動模型：自由落體運動。講述1971年宇航員做的實驗，加深印象；4、 了解地球表面物體下落運動近似成自由落體運動的條件；5、 著手研究自由落體運動的規(guī)律，利用打點計時器進(jìn)行研究，得到結(jié)論；6、 總結(jié)自由落體運動特點及重力加速度；7、 應(yīng)用訓(xùn)練
人教版新課標(biāo)高中物理必修1牛頓第二定律教案2篇
1．這節(jié)課以實驗為依據(jù)，采用控制變量的方法進(jìn)行研究。這一方法今后在電學(xué)、熱學(xué)的研究中還要用到。我們根據(jù)已掌握的知識設(shè)計實驗、探索規(guī)律是物體研究的重要方法。2．定義力的單位“牛頓”使得k=1，得到牛頓第二定律的簡單形式F=ma。使用簡捷的數(shù)學(xué)語言表達(dá)物理規(guī)律是物理學(xué)的特征之一，但應(yīng)知道它所對應(yīng)的文字內(nèi)容和意義。3．牛頓第二定律概括了運動和力的關(guān)系。物體所受合外力恒定，其加速度恒定；合外力為零，加速度為零。即合外力決定了加速度，而加速度影響著物體的運動情況。因此，牛頓第二定律是把前兩章力和物體的運動構(gòu)成一個整體，其中的紐帶就是加速度。四、評價方案及說明1、對科學(xué)知識與技能的評價要注重科學(xué)內(nèi)容的理解與應(yīng)用，而不是單純記憶。技能的評價目標(biāo)包括觀察技能、實驗技能等方面。對科學(xué)的技能的評價要盡量融合在科學(xué)探究過程的情景中。對科學(xué)知識的評價主要從兩方面，一是根據(jù)學(xué)生診斷性練習(xí)；二是通過學(xué)生作業(yè)反映學(xué)生掌握情況。
人教版新課標(biāo)高中物理必修1力學(xué)單位制教案2篇
一、教材分析在初中階段，物理量單位的學(xué)習(xí)是學(xué)生較為困惑的問題之一。前面關(guān)于1N的規(guī)定給學(xué)生的印象總好像是有些隨意。尤其是牛頓、帕斯卡、安培、伏特、焦耳、瓦特等單位的規(guī)定。使得學(xué)生感動物理太復(fù)雜。事實上，只有把單位制放在整個物理學(xué)框架中加以認(rèn)識，并且知識有了一定的積累。經(jīng)歷了充分的學(xué)習(xí)過程后才能體會物理量單位的命名和使用規(guī)則。體會到其中對一些單位進(jìn)行規(guī)定的合理性和方便特征。物理學(xué)單位中，有很少幾個基本物理量，它們的單位就是基本單位。在進(jìn)行了這種選定之后，其它物理量的單位就是根據(jù)它的定義式，有所選擇的其他物理量的單位共同確定的。國際單位制的建立和使用，不僅方便了國際間的交流，也逐漸成為科學(xué)研究中計算和運用的一種規(guī)范約束。中學(xué)生應(yīng)該注意學(xué)習(xí)，逐步習(xí)慣，在記錄、表達(dá)和計算中規(guī)范使用。二、教學(xué)目標(biāo)（一）知識與技能1．了解什么是單位制，知道力學(xué)中的三個基本單位；2．認(rèn)識單位制在物理計算中的作用
人教版新課標(biāo)高中物理必修1時間和位移教案2篇
一、教學(xué)目標(biāo)1、知識與技能（1）知道時間和時刻的含義以及它們的區(qū)別。知道在實驗室測量時間的方法。（2）知道位移的概念，知道它是表示質(zhì)點位置變動的物理量，知道它是矢量，可以用有向線段來表示。（3）知道位移和路程的區(qū)別。2、過程與方法（1）聯(lián)系生活實際，通過師生共同討論的方法來確定時刻與時間、位置、位移及其路程的關(guān)系。（2）通過類比的數(shù)學(xué)方法用數(shù)學(xué)上的點、線段來突破時刻與時間的關(guān)系，直線運動的位置和位移。（3）嘗試運用所學(xué)的概念判斷一些與生活相關(guān)的實際問題。3．情感態(tài)度與價值觀（1）通過本節(jié)課的學(xué)習(xí)，使學(xué)生體會到物理現(xiàn)象和規(guī)律所蘊含的自然美。（2）通過對問題的討論，培養(yǎng)學(xué)生勇于探究與日常生活有關(guān)的物理學(xué)問題。（3）培養(yǎng)學(xué)生有主動與他人合作的團(tuán)隊精神，提高學(xué)生的科學(xué)素養(yǎng)。二、教學(xué)重點、難點重點：1、時間、時刻、位置、位移的概念。2、矢量與標(biāo)量的概念。
人教版新課標(biāo)高中物理必修1重力基本相互作用教案2篇
具體過程：先用懸掛法確定重心之后，在板上固定一條細(xì)線ab，讓ab穿過重心c點，再在其重心c處拴上細(xì)繩提拉，驗證薄板可以水平平衡.如圖3-1-6、3-1-7所示.歸納：物體的重心可在物體之上，也可在物體之外.結(jié)論：規(guī)則均勻的物體重心在其幾何中心；不規(guī)則不均勻的物體重心用懸掛法.例3一個被吊著的均勻的球殼，其內(nèi)部注滿了水，在球的底部有一帶閥門的細(xì)出水口.在打開閥門讓水慢慢流出的過程中，球殼與其中的水的共同重心將會（）A.一直下降B.一直不變C.先下降后上升D.先上升后下降先讓學(xué)生自己回答，估計很多學(xué)生會選擇A；教師提示開始和最終重心的位置，學(xué)生很快就能得出正確答案.借機(jī)引導(dǎo)學(xué)生思考問題要全面.參考答案：在注滿水時，球殼和水的共同重心在球心，隨著水的流出，球殼的重心不變，但是水的重心下降，二者共同的重心在下降.當(dāng)水流完時，重心又回到球心，故選項C正確.
人教版新課標(biāo)高中物理必修1質(zhì)點參考系和坐標(biāo)系教案2篇
①平動的物體一般可以看作質(zhì)點做平動的物體，由于物體上各點的運動情況相同，可以用一個點代表整個物體的運動，在這種情況下，物體的大小、形狀就無關(guān)緊要了，可以把整個物體當(dāng)質(zhì)點。例如：平直公路上行駛的汽車，車身上各部分的運動情況相同，當(dāng)我們把汽車作為一個整體來研究它的運動的時候，就可以把汽車當(dāng)作質(zhì)點。當(dāng)然，假如我們需要研究汽車輪胎的運動，由于輪胎上各部分運動情況不相同，那就不能把它看作質(zhì)點了。要注意的是：同一物體在不同情況下有時可看質(zhì)點，有時不可以看作質(zhì)點，一列火車從北京開到上海，研究火車的運行的時間，可將火車看成質(zhì)點，而火車過橋時，計算火車過橋的時間，不可以將火車看成質(zhì)點。②有轉(zhuǎn)動但轉(zhuǎn)動為次要因素例如：研究地球公轉(zhuǎn)時，可把地球看作質(zhì)點；研究地球自轉(zhuǎn)時，不能把地球看作質(zhì)點。③物體的形狀、大小可忽略再如：乒乓球旋轉(zhuǎn)對球的運動的較大的影響，運動員在發(fā)球、擊球時都要考慮，就不能把乒乓球簡單看作質(zhì)點。
