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人教版高中生物必修1細胞的衰老與凋亡說課稿
4、最后從生物的壽命引入，探討細胞的死亡。強調(diào)細胞死亡有兩種形式。(1).細胞壞死，它是由某些外界因素造成細胞急速死亡，是一種被動性死亡；(2).細胞凋亡，這是一種由特定基因控制的主動性死亡。細胞壞死與細胞凋亡在形態(tài)學和生物化學上有著明顯的區(qū)別。細胞凋亡有廣泛的生物學意義，比如胚胎發(fā)育期手的發(fā)育如果沒有細胞的調(diào)亡就不會有纖細的手指；如果沒有正常的細胞調(diào)亡，蝌蚪的尾部就不會消失，它將永遠不能變成青蛙……。正常的細胞調(diào)亡還肩負著維持各種組織器官固有體積和形態(tài)的功能；還會使機體內(nèi)異常的細胞得到及時清除，去處潛在的隱患；例如癌癥就是異常的細胞沒有及時死亡的結(jié)果……。因此細胞的正常死亡是生物體的一種非常重要的調(diào)節(jié)機制，是機體平衡細胞增殖，調(diào)節(jié)機體細胞樹木恒定的方式，是必不可少的生命過程。（15分鐘）5、課堂小結(jié)，可以把課堂傳授的知識盡快地轉(zhuǎn)化為學生的素質(zhì)；簡單扼要的課堂小結(jié)，可使學生更深刻地理解政治理論在實際生活中的應(yīng)用，并且逐漸地培養(yǎng)學生具有良好的個性。
人教版高中生物必修2基因在染色體上說課稿
三、孟德爾遺傳規(guī)律的現(xiàn)代解釋①分離定律：在雜合體的細胞中，位于一對同源染色體上的等位基因，具有一定的獨立性；在減數(shù)分裂形成配子的過程中，等位基因隨同源染色體的分開而分離，獨立地隨配子遺傳給后代。②自由組合定律：位于非同源染色體上的非等位基因的分離或組合是互不干擾的；在減數(shù)分裂過程中，同源染色體的等位基因彼此分離的同時，非同源染色體上的非等位基因自由組合?？偨Y(jié)：再次強調(diào)孟德爾遺傳定律的現(xiàn)代解釋課堂練習：書本31頁6、教學反思：本節(jié)課設(shè)置了一系列問題情境，層層設(shè)問，在學生答問、質(zhì)疑、討論過程中讓學生建構(gòu)新概念和新的知識體系，并通過教師及時掌握反饋信息，適時點撥、調(diào)節(jié)，讓學生在推理判斷中培養(yǎng)良好的思維習慣和對知識的遷移能力，而且通過留出一定的時間讓學生提問，體現(xiàn)了以學生為主體的思想。
人教版高中生物必修2DNA的復(fù)制說課稿
設(shè)問：DNA復(fù)制后兩個子代DNA分子與親代DNA分子是否完全相同？為什么？通過設(shè)問，讓學生進一步理解和鞏固DNA復(fù)制的全過程。接下來讓學生總結(jié)出DNA復(fù)制的四大基本條件：① 模板：開始解旋的DNA分子的兩條單鏈；② 原料：是游離在核液中的脫氧核苷酸；③ 能量：是通過水解ATP提供；④ 酶：酶是指一個酶系統(tǒng)，不僅僅是指一種解旋酶。最后通過以上分析，總結(jié)出DNA復(fù)制的意義以及在生活中的應(yīng)用：意義：DNA通過復(fù)制，使遺傳信息從親代傳給子代，從而保證了物種的相對穩(wěn)定性，保持了遺傳信息的連續(xù)性，使物種得以延續(xù)。應(yīng)用：目前DNA分子廣泛應(yīng)用于刑事案件偵破等方面：如：DNA分子是親子鑒定的主要證據(jù)之一。把案犯在現(xiàn)場留下的毛發(fā)、血等進行分析作為破案的證據(jù)，與DNA有關(guān)。五、設(shè)計課堂練習：設(shè)計一題典型課堂練習：即有關(guān)半保留復(fù)制及計算的習題：
人教版高中生物必修2遺傳密碼的破譯說課稿
3、遺傳密碼的特點 連續(xù)性、簡并性、通用性5、課堂練習6、作業(yè)布置假如，我們利用(ACU)n核苷酸長鏈合成了含有蘇氨酸的多肽，那么蘇氨酸可能的密碼子有哪些？如何運用實驗方法確證蘇氨酸的密碼子究竟是什么？七、教學反思1、教材中豐富的科學史料，是我們在課堂上進行探究性學習活動的良好素材，教師要整理和運用好。千萬不要低估學生的思維能力，當學生的思維能力被你想方設(shè)法激發(fā)出來的時候，你會發(fā)現(xiàn)他們的創(chuàng)造力是無窮的。2、探究性學習的目的并不僅僅是問題的解決，更重要的是在探究過程中體驗和獲取科學研究方法，培養(yǎng)合作與分享的精神以及實事求是的科學態(tài)度，鍛煉思維能力，提高科學素養(yǎng)。3、學生是學習的主體，教師是引導(dǎo)者。我們要采取措施讓學生積極主動地參與到學習活動中來，通過他們的思考、討論、爭辯、合作等活動來獲取方法，建構(gòu)知識。
人教版高中英語必修1Journey Down the Mekong說課稿
2. let the Ss complete the forms paragraph by paragraph. Purpose here is to help Ss to get the habit of reading a passage as a whole, and pay attention to the organization of the text, as a result the Ss will fully understand the whole passage.3. ask Ss to retell the passage with the help of the key words in the form.Since the Ss in the class are in different levels, so I let them to fill in the blank to understand the meaning of the words and phrases better. ( That’s all for the while-reading. Now let’s move to the fifth step.)Step V: Post-reading (10mins) ---DiscussionIn this part students are asked to discuss in groups and list Wang Kun’s and Wang Wei’s attitudes about the trip. After that, Ss are encouraged to express their attitudes with the whole class. Collect their answers and don’t forget to praise them even if their answers may not be perfect.In this activity, discussion provides a vivid and active learning environment for Ss to communicate in English with newly learned language items. (Finally it comes to the homework.)StepⅥ: Homework (1min)1. Ss are required to read the text again after class and figure out the meaning of some complex sentences.2. Do the exercises on P19; This can help Ss to consolidate what they’ve learnt and make preparation for the next lessonPart4. Blackboard design.（說板書設(shè)計）On the top, there is the title of this lesson. On the left, there are main ideas for each paragraph. On the right, there are some new words and expressions.Unit 3 Travel journalJourney down the MekongMain idea of each para.:Para1: deciding to take a great bike trip along the Mekong river.Para2: Different attitudes between Wang kun and Wang wei.
人教版高中英語必修4Body Language說課稿4篇
Textbook: Senior English for China (Book 4), by Liu Daoyi Time Allotment: 1 period (40 minutes)Date: March 20, 2014Teaching aids: blackboard, Multi-media, Power Point, chalk I. Text Analysis （教材分析）This unit is about body language, and the text selected in the reading part demonstrates the difference and similarity of body language in many parts of the world. Through learning this passage, students are required to raise their awareness of using body language in different parts of the world. As body language is closely related to our daily life, it is easy to arouse students’ interest in learning this text. Reading skills and speaking training are designed around the text.II. Teaching Objectives （教學目標）By the end of the lesson, students will be able to:1. Language Skill Objective（語言技能目標）: develop reading ability （skimming and scanning）as well as speaking ability.2. Cultural Knowledge Objective（文化知識目標）: know about the cultural differences of using body language.3. Affective Objective（情感目標）: increase students’ awareness of using body language correctly in different cultures. III.Teaching Focuses and Difficulties（教學重點和難點）1. Teaching Focuses（教學重點）: the difference and similarity of body language in many parts of the world.2. Teaching Difficulties（教學難點）: develop students’ reading abilities of skimming and scanning and ask the students to show their opinions with fluent English.
人教版高中英語必修1Anne's best friend說課稿
Step 7 Language points 1．Vocabulary (1) go through (2) set down (3) a series of (4) on purpose (5) in order to (6)at dusk (7)entirely (8)face to face 2．Important sentences (1)…I’ve grown so crazy about everything to do with nature. (2)There was a time when … (3)I stayed awake on purpose until … (4)It was the first time … that I’d seen the night … (5)It’s no pleasure looking through … Purpose: 1．Master the required vocabulary and sentence structures. 2．Use them freely. Step 8 Consolidation 1．Find out the topic sentences 2．Retell the text according to the topic sentences Purpose: I want to know if my students understand the text. Step 9 Discussion Imagine you have to go into hiding like Anne and her family, what would you miss most? Giveyour reasons. Purpose: Train Ss’ oral English ability. Step 10 Homework Write an article on Friends. Purpose: 1． Improve the Ss’ writing ability. 2 Train the Ss’ ability of self—teaching and looking up information by themselves. Part 5 Blackboard design（說板書設(shè)計）Unit 1 Friendship Reading Anne’s Best Friend 1．Main idea of each paragraph: Para. 1 Anne made her diary her best friend. Para .2 Anne wrote her feelings in her diary. Para .3 Anne missed nature. Para.4 Anne saw the night face to face Para.5 Anne wanted to experience nature outdoors. 2．Listening: Exx.1 P3 3．Discussion: Exx.3 P3 Purpose: 1．Make Ss familiar with the passage 2．Make the design inductive, instructive and artistic.
人教版高中英語必修1English around the world說課稿
(3)v. 給：提出；展現(xiàn)，顯現(xiàn)present sb. with sth. ; present sth. to sb. 把. . 交給；頒發(fā)；授予present sth. (for sth. )/present sth. to sb. e. g. Om his birthday, his friends presented him a collection of stamps. 在他生日時，他的朋友們送給他一套郵票作為禮物。The sword was presented by the family to the museum. 這家人把寶劍捐贈給了博物館。The committee will present the final report to Parliament in June. 委員會將在六月向議會提交最后的報告。You need to present yourself better. 你需要更善于展現(xiàn)自己。It is essential that we present a united front. 至關(guān)重要的是我們要表現(xiàn)得更加團結(jié)。Step 4 ConsolidationT:Now that we have got a general idea of these words and phrases. Lets make up some sentences using them to master them. Suggested sentences:1. Your duties include typing letters and answering the telephone. 2. It is one of the greatest roles that she has played. 3. A large number of people have applied for the job. 4. The number of the panda is declining. 5. I'11 go there, even if I have to walk. 6. He came up to me to ask for a light. 7. The novel is about a family who can't communicate with each other. 8. He based his plan on interests of most people. 9. Why doesn't he make use of his singing talent?Step 5 Summary and homeworkT:Today we dealt with several new words and phrases. After class I hope that youcan read them again and again to keep them in mind. That's all for today. You aredismissed.
人教版高中英語必修1Nelson Mandela--A Modern Hero說課稿
In this step, give students a few minutes to read the passage . While they are reading, I will write some key words of the text on the blackboard. Then ask students to retell the passage according to the key words.By retelling, students can improve their ability of language organization and have an overall understanding of the article.Step 4 Group discussionIn this step, students will be divided into groups of 4 to discussion the following question: What qualities make a great person?After their discussion, invite a few groups to make a report to the class.This group discussion can practice students’ oral English and cultivate their abilities of cooperation and communication.Step 5. HomeworkLet students write a short passage to introduce a great person he or she admires.The homework can consolidate the knowledge the students have learned and cultivate their writing ability. Part 6 Blackboard Design（板書設(shè)計）That’s all my teaching procedures. Finally, I’d like to say sth about part 6 blackboard design. On the top is the title. On the left, there will be some new words and expressions. In the middle of the blackboard, I will write some useful sentence structures so that the students can know clearly what they’ve learned and then try to master the knowledge.OK. That’s all for my presentation. Thank you for your attention.
人教版高中英語必修2Cultural Relics說課稿2篇
Ⅲ. Analysis of the teaching material:The topic of this unit is cultural relics. Students are quite interested in topics about different cultures around the world. This is the second period of the whole unit. As a reading class, the passage mainly talks about the history of the amber room (how it was made, sent as a gift, lost and rebuilt).According to the new national curriculum, when teaching reading, much emphasis should be put on training the students’ reading skills.Ⅳ. Teaching objectives1. Language objectives:1) Students are required to master the key words and phrases occurred in the passage (e.g. amazing, decorate, belong, in return, less than etc.)2) Students are required to learn the attributive clause and acquire the sentence pattern.2. 1) Students are required to describe a certain thing by using the new sentence patterns.2) Students are required to master two kinds of reading skills—skimming and scanning, and learn to use them in their daily reading.3. 1) Students are required to know the history of the amber room.2) Students are required to appreciate cultural relics and understand the importance of protecting them.Ⅴ. Teaching important and difficult points1) the new words, phrases, and sentence pattern in the course of reading.2) Teaching difficult point: Help the students master two kinds of reading skills—skimmingand scanning and learn to apply them in daily use.Ⅵ. Teaching methods:Task-based method & Top-down model Ⅶ. Teaching aids: PPT, pictures, blackboard Ⅷ. Teaching procedure:
人教版高中英語必修2The Olympic Games說課稿2篇
Purpose of my design:To ask the students to do these two tasks will make the Ss predict the story of this passage. As a result, it will deepen Ss’ memory of this story because they will have their own understanding of this story.Step 3. While-readingTask 1. (Individual work _____min)Skimming: ask students to skim the text and the main ideas of each paragraph in this passage. Please read it quickly and then match the sentences with the letters.Task 2. (Individual work _____min)Scanning: read the text quickly and decide the whether the following statements are true or false and give reasons.Task 3. (Pair work _____min)Listen to the tape and fill in the banks. Then read the paragraph with expression to your partner.Task4 (individual work min)Listen to the tape again and write down the main idea in one sentence.Purpose of my design: Enable students to understand the given material better by using different reading skills. And proper competition can arouse the Ss’ interest in English learning. “Task-based” teaching method is used here todevelop the Ss’ ability of communication and also their ability of co-operation will be well trainedStep 4. Post-readingTask 1. (Individual work, pair work, group work, class work; _____min)Discussion (group of 4):1. If you were Hippomenes, would you run against Atlanta?2. Do you think Hippomenes deserved to win the race? Why or why not?Step 5. HomeworkPlease read the story again carefully after class and imagine: What will happen during the race between Hippomenes and Atlanta? Who do you think will win the race? Do you think Atlanta would marry Hippomenes? Write an end for the story with thses questions.Purpose of my design: Homework is so important and necessary for to master the knowledge they learned after class. It will check whether the Ss achieve the teaching aims.Part 5 Blackboard design
人教版高中英語必修4Women of achievement說課稿4篇
Good morning, distinguished judges:It’s my honor to talk about my teaching ideas with you. Today my topic is Women of Achievement. My presentation consists of six parts: the analysis of teaching material and student, teaching aims, key and difficult points, teaching and studying method, teaching procedures and blackboard design.First, let’s focus on the analysis of teaching material. This lesson is from New Senior English for China Student’s Book 4 Unit 1, the reading part. The main topic of the passage is the introduction of a student of Africanwildlife. After this lesson, the students will learn more information about her studying chimps in Africa, and their reading and speaking abilities can be developed as well.The next part is the analysis of students. My students are in senior high students. They have learnt English for many years, they’ve known many words and sentences, but their speaking and reading abilities are still not very good. So I will practice their speaking and reading abilities through different exercises.According to the New Standard Curriculum and the present situation, I set the teaching aims as follows: firstly, knowledge aims. Students can grasp some new words, such as worthwhile, move off. Moreover, students can understand the content of the passage and get familiar with the topic of studying chimps in wildlife. Secondly, ability aims. Students can use reading strategies such as skimming and scanning in reading process. Thirdly, emotional aims. Students can have the awareness of protecting animals and care about animals.Based on the above analysis, the key point of this lesson is to get the main idea and the detailed information from the passage; the difficult point is to talk about the wildlife protection and use reading strategies.
人教版高中英語必修5First aid說課稿6篇
In this class, I have 3 teaching aims, that is, knowledge aims, ability aims and emotion aims.1) Knowledge-Teach students new words and expressions, such as temporary, bleed,sprain choke, first aid, fall ill and so on.-Enable students to have a better understanding for some basic knowledge of first aid.2) Ability-Train students’ speaking, reading and writing abilities by different teaching activities, such as skimming, comprehending, team work, role play, retelling and writing.-Develop students’ reading strategy on how to move general idea to specific information.3) Emotion-Promote students’ awareness of giving first aid.- Cultivate students’ creativities.Then let’s come to my teaching methods and activities.III. Teaching methods and activities:To achieve different teaching aims, various kinds of teaching methods and activities will be adopted throughout this period, such as TBL (task-based learning), skimming, team work, brainstorm and others, which can offer students opportunities to fulfill tasks in which they can use language to achieve a specific outcome.IV. Teaching aids:Computer and blackboardV. Teaching important points:1) Make students have a clear mind for the structure of the text.2) Help students understand the theme of the text.VI. Teaching difficulties:1) So many new words may affect students’ understanding.2) How to get students to know about the functions of the skin and thecauses, characteristics and treatments for different degree burns,and the knowledge about giving first aid. VII. Blackboard design:
人教版高中英語必修5Life in the Future說課稿5篇
Good afternoon, everyone. It’s my great pleasure to be here sharing my lesson with you. The content of my lesson is Senior English for China Book5 Unit 3 Life in the Future. I’ll be ready to begin this lesson from six parts: Analysis of the teaching material, Analysis of the students, Teaching aims and important and difficult points, Teaching methods and aids, Teaching procedures, and Blackboard design. First, let me talk about the teaching material.Part 1 Analysis of the Teaching Material:This unit is about what human beings’ life will be like in about one thousand years. By studying of this unit, we’ll Enable the students to know the changes in humans’ life and some new inventions bringing about the change and develop the interest in science. This lesson plays an important part in the English teaching in this unit. This is an important lesson in Book Five. From this lesson, it starts asking the Ss to grasp contents of each passage. Therefore, this lesson is in the important position of the teaching material. If the Ss can learn it well, it will be helpful to make the Ss learn the rest of this unit.Part 2 Analysis of the SsAs Senior2 Ss, they are at different levels of English fluency, some of them have lost interest in English. So during the lesson, I arrange a variety of activities to let all of them join in to attract their interest and let them be confident and taste the joy of success.
人教版高中英語必修5Making the news說課稿4篇
今天我們來介紹一下必修五第四單元的授課方式。這個單元的題目是Making the news。應(yīng)該是學生比較感興趣的話題，學生往往對新聞工作充滿好奇，所以我們可以利用這個機會多設(shè)計一些師生互動和學生互動，來激發(fā)起學習的積極性，提高學習效率。同時我們可以利用這個單元不僅幫助學生掌握語言知識，培養(yǎng)語言能力，同時讓其了解新聞工作的重要性，培養(yǎng)起社會智能感。這個單元分為六個課時，它的教學目標是這樣的：語言目標是掌握詞匯表中的常用單詞和短語，掌握倒裝句的一些基本用法。 技能目標是能初步掌握約會的基本句型并在真實的場景下正確運用。新聞報道類文章的寫作技能。采訪的基本規(guī)范和溝通技能。情感目標是對新聞報道的客觀性和真實性有更好的理解。對新聞記者的職業(yè)有更深入的了解，并能體會其工作的重要性。下面我們來介紹一下第一課時的授課方式，第一課的教學目標是這樣的第一課時的教學目標語言目標:單詞：Occupation, journalist, editor, photographer, curious, personality, enthusiasm
人教版高中地理必修2綠色產(chǎn)品知多少說課稿
各小組派代表匯報。4、教師提出問題組織學生討論：⑴要想了解更多的綠色食品，了解綠色食品的銷售情況，我們應(yīng)該怎么做？⑵要想了解廣大消費者對綠色食品的態(tài)度，食用綠色食品的意義，是否懂得辨認綠色食品，以及什么樣的人群對此知識最缺乏等，我們應(yīng)該怎么做？組織學生匯報交流。5、做個“綠色食品”廣告設(shè)計師。為你喜歡的綠色食品設(shè)計廣告語，每組推薦一個。6、讓學生了解綠色食品認證程序。7、綠色食品打“假”隊員在行動。8、向?qū)W生介紹生態(tài)綠色食品基地。三、活動總結(jié)：通過研究、探討，了解學生對綠色食品的態(tài)度。提問：民以食為天，吃，是一個大問題，如果你的爸爸媽媽讓你到超市買牛奶、方便面等，你會選擇什么樣的食品？為什么？希望通過今天的學習，同學們能夠做到綠色消費，也希望你們向自己的家人、向周圍的了解學生對“無公害食品”、“有機食品”與“綠色食品”的認識。
人教版高中地理必修2煤城焦作出路何在說課稿
分析過焦作市的地理概況和產(chǎn)業(yè)優(yōu)勢后，就需要針對由于資源枯竭所帶來的問題提出合理化的建議。既然是談經(jīng)濟轉(zhuǎn)型，就應(yīng)該將話題的范圍明確在這一領(lǐng)域內(nèi)。通過材料3的相關(guān)內(nèi)容，我們了解到焦作市需要在產(chǎn)業(yè)結(jié)構(gòu)調(diào)整、培育新的優(yōu)勢產(chǎn)業(yè)、增強綜合競爭力等三個整改方針上下功夫。因而引導(dǎo)學生針對優(yōu)勢與不足提出建議，以三個整改方針為基準，衡量建議的可行性是鍛煉學生解決此類問題的有效途徑。在此我將教會學生的是解決問題方法而非案例的內(nèi)容，正所謂“授之以魚，不如授之以漁”。接下來針對學生的建議和教材資料分析所羅列的10點整改思路，由學生自由發(fā)言提出看法，通過教師的指導(dǎo)和學生的討論，進而確定經(jīng)濟轉(zhuǎn)型建議的具體方案。最后注意將建議與產(chǎn)業(yè)優(yōu)勢相對照，看建議是否都是圍繞著產(chǎn)業(yè)優(yōu)勢而提出的，這樣做會加深學生的印象，通過建議和優(yōu)勢的對應(yīng)關(guān)系，將不難找出此類問題的解題思路。
人教版新課標高中物理必修1摩擦力說課稿2篇
本節(jié)課是人教社物理必修1第三章第三節(jié)的內(nèi)容，編排在彈力之后。該節(jié)知識既是力學的基礎(chǔ)，也是組成整個高中物理知識的一塊“基石”，所以這節(jié)內(nèi)容的教學如何引領(lǐng)學生自主積極地探究摩擦力產(chǎn)生的條件和影響因素，體驗?zāi)Σ亮μ攸c規(guī)律的發(fā)生過程是本節(jié)課的重點，應(yīng)高度重視本節(jié)教學過程；由于摩擦力問題的復(fù)雜性，且在具體問題中又表現(xiàn)出“動中有靜，靜中有動”，尤其靜摩擦在許多情形下似乎又是“若有若無，方向不定”，因此，對于初學者也是有一定難度的。也正是由于教材內(nèi)容的上述特點，本節(jié)課又易于激起學生的求知欲，易于培養(yǎng)學生的辯證觀點，易于錘煉學生的物理素質(zhì)。要充分用好該節(jié)教材內(nèi)容，深入挖掘知識間的有機聯(lián)系，對學生開展針對性的思維訓(xùn)練，進而提高學生應(yīng)用物理知識解決實際問題的能力和創(chuàng)新思維能力。高中物理《課標》對該知識點的要求是，“通過實驗認識滑動摩擦、靜摩擦的規(guī)律，能用動摩擦因數(shù)計算摩擦力”。其中，對靜摩擦力規(guī)律的認識應(yīng)該包括最大靜摩擦力。
人教版新課標高中物理必修2功率說課稿2篇
（一）、復(fù)習提問1、請說出功的計算公式及功的單位2、我們用哪個物理量表示物體運動的快慢？（二）、創(chuàng)設(shè)情景，引入新課1、播放多媒體素材，用起重機和一個工人搬運幾百塊磚比較哪一種方法好？圖中的情景說明了什么問題?（教師通過所設(shè)計的情景，將學生引入怎樣比較做功快慢，讓學生發(fā)表自己的看法，初步知道物體做功是有快慢之分的。）（三）、進行新課1、比較做功快慢的方法播放多媒體素材并提出問題：怎樣比較兩個人誰做功快誰做功慢？教師啟發(fā)：以前學習過要比較兩物體運動的快慢，可以先確定路程再比較時間，也可以先確定時間再比較路程。在路程和時間都不同時，通過計算速度比較兩物體運動的快慢。同理，要比較物體做功的快慢可采用什么方法？
人教版新課標高中物理必修2功說課稿2篇
探究一：高中階段功的含義是什么？投影：初中九年級《物理》105頁學生思考：①圖中物體的勢能、動能分別如何變化？②物體能量的變化和做功是否存在關(guān)系？學生:分組討論，得出結(jié)論：如果物體的能量發(fā)生變化時，說明有力對物體做了功。教師:進行點評和小結(jié)(設(shè)計意圖：對初中知識深化理論認識，并為以后功能關(guān)系的教學作準備)探究二：力對物體做功的兩個要素是什么？情景再現(xiàn)：找體重相對懸殊的兩位同學，①A同學試圖抱起B(yǎng)同學，但沒成功。②B同學抱起A同學在教室內(nèi)勻速走動。學生思考：在①中，A是否對B做功？在②中，B是否對A做功？學生:分析得出做功的兩要素：物體受到力的作用，并且在力的方向上發(fā)生位移.教師:讓學生分別例舉生活中力對物體做功和不做功的例子，（設(shè)計意圖：讓學生親身參與課堂實驗，烘托課堂氣氛，相互協(xié)作增進同學情誼）探究三：如果物體的位移不再力的方向上，那么力是否還對物體做功？