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人教版新課標高中物理必修1勻變速直線運動的速度與時間的關系教案2篇
一、設計思想通過本節(jié)教學，不但要使學生認識掌握勻變速直線運動的規(guī)律，而且要通過對這問題的研究，使學生了解和體會物理學研究問題的一個方法，圖象、公式、以及處理實驗數(shù)據(jù)的方法等。這一點可能對學生更為重要，要通過學習過程使學生有所體會。本節(jié)在內(nèi)容的安排順序上，既注意了科學系統(tǒng)，又注意學生的認識規(guī)律。講解問題從實際出發(fā)，盡量用上一節(jié)的實驗測量數(shù)據(jù)。運用圖象這種數(shù)學工具，相對強調了圖象的作用和要求。這是與以前教材不同的。在現(xiàn)代生產(chǎn)、生活中，圖象的運用隨處可見，無論學生將來從事何種工作，掌握最基本的應用圖象的知識，都是必須的。學生在初學時往往將數(shù)學和物理分割開來，不習慣或不會將已學過的數(shù)學工具用于物理當中。在教學中應多在這方面引導學生。本節(jié)就是一個較好的機會，將圖象及其物理意義聯(lián)系起來。
必修一牛頓第一定律教案
(二)?過程與方法? 4.?觀察生活中的慣性現(xiàn)象，了解力和運動的關系? 5.?通過實驗加深對牛頓第一定律的理解? 6.?理解理想實驗是科學研究的重要方法? (三)?情感態(tài)度與價值觀? 7.?通過伽利略和亞里士多德對力和運動關系的不同認識，了解人類認識事物本質的曲折性? 8.?感悟科學是人類進步的不竭動力
人教版高中生物必修3第三章第一節(jié)《植物生長素的發(fā)現(xiàn)》說課稿
（5）根據(jù)實驗的第五部分——驗證性實驗結果，證實了達爾文關于植物向光性運動原因的假說――確實存在一種物質致使胚芽尖端產(chǎn)生了向光運動。這樣通過多個實驗的多媒體演示過程，強化學生的思維，最終在學生的大腦中形成科學研究過程的”條件反射”。為了使學生初步學會”設計對照實驗的方法”，首先也利用多媒體的演示實驗，并在其中特意設置一些”陷阱”，通過多次”請學生進入‘陷阱’”，來強化設計實驗時應該控制的變量問題，從而在學生的認知領域里初步構建出設計對照實驗的知識體系。3、歸納總結1934年，荷蘭科學家郭葛等人從植物中分離出了這種能使植物產(chǎn)生向光性的物質，并確定它就是吲哚乙酸。這就真正從化學物質的角度證實了達爾文的假設。在能夠從植物體中分離提取出生長素之后，要想知道：除了能使植物產(chǎn)生向光運動之外，生長素對于植物的器官還有什么作用？可以采用哪種方法來進行試驗？
人教版高中語文必修2《就任北京大學校長之演說》說課稿3篇
（三）教學重、難點1、教學重點：結合課文，了解演講辭針對性強、條理清楚、通俗易懂、適當?shù)母星樯实忍攸c。2、教學難點：深入理解文章內(nèi)涵，聯(lián)系現(xiàn)實，體會本文的現(xiàn)實意義二、說學情高中學生在初中階段已經(jīng)接觸過演講辭了，對演講詞的特點已經(jīng)有了一些基本的知識，因此本輪的教學應該讓他們在此基礎上有所提高。本文是學生在高中階段第一次接觸演講辭，有必要讓他們了解演講辭的特點及課文如何體現(xiàn)這些特點的。隨著年齡的增長，生活閱歷的增加，高中學生正逐漸形成自己對世界、對人生的看法，蔡元培先生的這篇文章能很好地激發(fā)他們對當前的高中學習和未來的大學生活進行思考。此外，學生對北大的歷史及蔡元培先生作這番演講的時代背景了解不深，應作出補充說明。
人教版高中生物必修3第三章第二節(jié)《生長素的生理作用》說課稿
強調重力對生長素分布的影響，為下面的內(nèi)容講解做鋪墊，明確植物出現(xiàn)向光性與生長素分布不均有關。復習舊知識，產(chǎn)生首因效應，鞏固和加強記憶。通過植物向光性是生長素分布較多而促進生長，進而提出“對于植物來說，生長素是不是越多越好”這個問題，引發(fā)思考，鍛煉思維。說明生長素濃度對不同器官產(chǎn)生的影響不同，讓學生對這一情況有一個整體印象。結合數(shù)學知識逐步分析圖上各點和各曲線的含義，引導學生得出不同器官對生長素濃度的敏感性順序，為解釋橫放植物“S”型生長做鋪墊。通過對曲線的分析，得出低生長素濃度起促進作用，高濃度有抑制作用這種雙重性，并得出其雙重性表現(xiàn)。通過以上的分析和總結，對橫放植物“S”型生長進行解釋，達到首尾呼應的效果。采用“蒙太奇”手法，引申到“太空中，橫放植物將會如何生長”這個問題，引發(fā)學生的聯(lián)想和思考，以這種提問方式結課為下節(jié)課的開課做了鋪墊，掌握了主動權。
人教版高中政治必修4人的認識從何而來說課稿（一）
展示學習過的物理學內(nèi)容：伽利略的“比薩斜塔”實驗，證明了：兩個鐵球同時落地。得出結論：實踐是檢驗認識正確與否的唯一標準。（因為這點理解起來有點難，所一教師要適當?shù)闹v解）A、一種認識是否是真理不能由這一認識本身回答B(yǎng)、客觀事物自身也不能回答認識是否正確地反映了它C、實踐是聯(lián)系主觀與客觀的橋梁。人們把認識和實踐的結果對照,相符合,認識就正確?！?實踐是認識的目的和歸宿：走進社會：（課本P46歸國博士案例）從這個故事中我們可以得到什么啟示？得出結論：實踐是認識的歸宿和目的。啟發(fā)學生學以致用，eg：紀中的學生研究地溝油簡易檢測方法（靈活利用身邊的教學資源）?！景鍟O計】實踐是認識的基礎（板書）投影：逐步展示本課知識結構圖。學生通過回憶，讓學生有直觀的認識，學習內(nèi)容一目了然。1．實踐是認識的來源。2．實踐是認識發(fā)展的動力。3．實踐是檢驗認識的真理性的唯一標準。
人教版高中政治必修4人的認識從何而來說課稿（二）
今天我說課的題目是《生活與哲學4（必修）》的第二單元第六課第一框題——《人的認識從何而來》下面我將從教材，教法，學法，教學過程，教學反思五個方面來說一說我對本課的認識和教學設想。一、說教材我將從該框題在教材中的地位和作用，教學目標，教學重難點三方面來闡述我對教材的認識。（一）首先是教材的地位和作用；本框題重點論述馬克思主義哲學認識論中實踐與認識的關系。實踐的觀點是馬克思主義首要和基本的觀點，理解實踐與認識的關系是把握哲學智慧不可或缺的途徑。學好本框題不僅有利于學生從宏觀上把握教材各課的聯(lián)系，而且有利于幫助學生理解馬克思主義哲學的本質特征。（二）教學目標是確定教學重點，進行教學設計的基礎。依據(jù)新課程標準，我確定本課的教學目標有以下三方面：知識與技能：1、識記實踐的含義、實踐的構成要素、實踐的特點。
人教版高中語文必修3《師說》說課稿3篇
一、設計理念教學設計堅持少講多學、以學為主的教學理念，重視學培養(yǎng)生的學習興趣，要充分調動學生學習的積極性和主動性，充分發(fā)揮學生的主體性。教師要以組織者、引導者、合作者的角色參與到教學活動中去。力圖通過導學案努力培養(yǎng)學生的自學習慣和自學能力。二、教材分析與處理1、教材的地位與作用：必修三第三單元所選的文言文都是古代的議論性散文。本課是“唐宋八大家”之首、中唐古文運動的倡導者韓愈的力作，是唐宋散文中的名篇，具有很強的代表性。通過這篇自讀課的學習，能使學生了解唐宋散文的風貌，更能使學生進一步積累文言文基礎知識，提高學生的文言文閱讀欣賞能力，從而提升學生的文言文自讀能力。2、教學目標：《高中語文課程標準》要求高中學生能閱讀淺易文言文，能借助注釋和工具書，理解詞句含義，讀懂文章內(nèi)容；了解并梳理常見的文言實詞、文言虛詞、文言句式的意義或用法，注重在閱讀實踐中舉一反三；對文章有一定的分析欣賞能力。高一的學生對于文言文的知識還在積累階段，應該注重基礎知識的積累和一定量的誦讀。對此，我將教學目標確定為：
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計四
該板塊的活動主題是“介紹一個有顯著文化特征的地方”( Describe a place with distinctive cultural identity)。該板塊通過介紹中國城繼續(xù)聚焦中國文化。本單元主題圖呈現(xiàn)的是舊金山中國城的典型景象, Reading and Thinking部分也提到中國城,為該板塊作鋪墊。介紹中國城的目的主要是體現(xiàn)中國文化與美國多元文化的關系,它是美國多元文化的重要組成部分。中國城也是海外華人的精神家園和傳播中國文化的重要窗口,外國人在中國城能近距離體驗中國文化。1. Read the text to understand the cultural characteristics of Chinatown in San Francisco and the relationship between Chinese culture and American multiculturalism;2. Through reading, learn to comb the main information of the article, understand the author's writing purpose and writing characteristics;3. Learn to give a comprehensive, accurate, and organized description of the city or town you live in;Learn to revise and evaluate your writing.Importance:1. Guide the students to read the introduction of Chinatown in San Francisco and grasp its writing characteristics;2. Guide students to introduce their city or town in a comprehensive, accurate and organized way;3. Learn to comb the main information of the article, understand the author's writing purpose, and master the core vocabulary.
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計三
The price is the same as(the price was)before the war.價格與戰(zhàn)前相同。(4)定語從句中的“關系代詞＋助動詞be”可以省略。The ticket(that/which was)booked by his sister has been sent to him.他妹妹訂的那張票已送到了他那里。Step 5 PracticeActivity 3(1) Guide students to complete the four activities in the Using Structures part of exercise book, in which activities 1 and 2 focus on ellipsis in dialogue answers, activity 3 focus on signs and headlines, two typical situations where ellipsis is used, and activity 4 focus on ellipsis in diary, an informal style.(2) Combine the examples in the above activities, ask students to summarize the omitted situations in groups, and make their own summary into a poster, and post it on the class wall after class to share with the class.(This step should give full play to the subjectivity of students, and teachers should encourage students to conclude different ellipsis phenomena according to their own understanding, they can conclude according to the different parts omitted in the sentence.)Step 6 Homework1. Understand and master the usages of ellipsis;2. Finish the other exercises in Using structures of Workbook.1、通過本節(jié)內(nèi)容學習，學生是否理解和掌握省略的用法；2、通過本節(jié)內(nèi)容學習，學生能否根據(jù)上下文語境或情景恢復句子中省略的成分，體會使用省略的效果；3、通過本節(jié)內(nèi)容學習，學生能否獨立完成練習冊和導學案中的相關練習。
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計二
(2)Consolidate key vocabulary.Ask the students to complete the exercises of activity 6 by themselves. Then ask them to check the answers with their partners.(The first language:Damage of the 1906 San Francisco earthquake and fire.A second language: Yunnan - one of the most diverse provinces in China).Step 5 Language points1. The teacher asks the students to read the text carefully, find out the more 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)容學習，學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)容學習，學生能否結合文本特點了解文章的結構和作者的寫作邏輯；3、通過本節(jié)內(nèi)容學習，學生能否了解舊金山的城市風貌、文化特色，以及加利福尼亞州的歷史，體會多元文化對美國的影響。
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計一
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.
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計一
本板塊的活動主題是“談論節(jié)日活動”（Talk about festival activities），主要是從貼近學生日常生活的角度來切入“節(jié)日”主題。學生會聽到發(fā)生在三個國家不同節(jié)日場景下的簡短對話，對話中的人們正在參與或將要親歷不同的慶祝活動。隨著全球化的進程加速，國際交流日益頻繁，無論是國人走出國門還是外國友人訪問中國，都已成為司空見慣的事情。因此，該板塊所選取的三個典型節(jié)日場景都是屬于跨文化交際語境，不僅每組對話中的人物來自不同的文化背景，對話者的身份和關系也不盡相同。1. Master the new words related to holiday: the lantern, Carnival, costume, dress(sb)up, march, congratulation, congratulate, riddle, ceremony, samba, make - up, after all. 2. To understand the origin of major world festivals and the activities held to celebrate them and the significance of these activities;3. Improve listening comprehension and oral expression of the topic by listening and talking about traditional festivals around the world;4. Improve my understanding of the topic by watching pictures and videos about different traditional festivals around the world;5. Review the common assimilation phenomenon in English phonetics, can distinguish the assimilated phonemes in the natural language flow, and consciously use the assimilation skill in oral expression. Importance:1. Guide students to pay attention to the attitude of the speaker in the process of listening, and identify the relationship between the characters;2. Inspire students to use topic words to describe the festival activities based on their background knowledge. Difficulties:In the process of listening to the correct understanding of the speaker's attitude, accurately identify the relationship between the characters.
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計二
1. Ss look at the picture and scan the passage to understand the main idea while teacher is giving the following questions to inspire Ss to think.*Where are those people?*What are they doing?*Why are they so excited?2. Ss complete the passage with the appropriate -ing form. Then discuss and check the answers with class.Answers: boring, interesting, taking, exciting, amazing3. The teacher raises questions for the students to discuss and encourages them to express their opinions.*Do you like La Tomatina? Why or why not?4. Each group representative reports the discussion result, the teacher gives feedback and the evaluation.Step 6 PracticeActivity 41. Ss complete the Ex 2 in Using structures.2. Check the answers after finishing the exercises.①The dragon boat races are the most exciting part of the Dragon Boat Festival.② The children were excited to go Easter egg hunting.③What an amazing performance! This is the best music festival I have ever been to.④We were amazed by her funny-looking hat.⑤His inspiring speech at the conference won the admiration/ favour of the audience.⑥This is a challenging game to test your memory and observation capabilities. 3. T asks Ss to finish Ex 3 and 4 in Using structures by themselves, then check the answers with class.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)容學習，學生是否理解和掌握動詞-ing形式作定語和表語的功能和意義；2、通過本節(jié)內(nèi)容學習，學生能否在理解文段內(nèi)容的基礎上，根據(jù)上下文語境和表達邏輯，能正確運用動詞-ing形式描述節(jié)日慶典。3、通過本節(jié)內(nèi)容學習，學生是否歸納和積累用于表達情緒的相關詞匯。
新人教版高中英語必修3Unit 2 Morals and Virtues教學設計四
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)容學習，學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)容學習，學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)容學習，學生能否根據(jù)故事的起因、經(jīng)過和結果來深入理解故事的情節(jié)，從而了解文章的層次結構；4、結合現(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 2 Morals and virtues教學設計一
(2) students are divided into groups according to the requirements of activity 3. Each student shares a story of personal experience or hearing-witnessing kindness, and then selects the most touching story in the group and shares it with the whole class. Before the students share the story, the teacher can instruct them to use the words and sentence patterns in the box to express. For example, the words in the box can be classified:Time order: first of all, then, after that, later, finally logical relationship :so, however, although, butTeachers can also appropriately add some transitional language to enrich students' expression:Afterwards, afterwards, at last, in the end, eventuallySpatial order: next to, far from, on the left, in front ofOtherwise, nevertheless, as a result, therefore, furthermore, in addition, as well asSummary: in a word, in short, on the whole, to sum up, in briefStep 8 Homework1. Understand the definition of "moral dilemma" and establish a correct moral view;2. Accumulate vocabulary about attitudes and emotions in listening texts and use them to express your own views;3. Complete relevant exercises in the guide plan.1、通過本節(jié)內(nèi)容學習，學生能否理解理解“道德困境”的定義；2、通過本節(jié)內(nèi)容學習，學生能否通過說話人所表達的內(nèi)容、說話的語氣、語調等來判斷其態(tài)度和情緒；3、通過本節(jié)內(nèi)容學習，學生能否針對具體的道德困境發(fā)表自己的看法和見解，能否掌握聽力理訓練中的聽力策略。
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計三
*wide range of origins(= a great number of different origins, many kinds of origins)*It featured a parade and a great feast with music, dancing, and sports. (=A parade and a great feast with music, dancing, and sports were included as important parts of the Egyptian harvest festival.)*.. some traditions may fade away and others may be established.(= Some traditions may disappear gradually, while other new traditions may come into being.）Step 6 Practice(1) Listen and follow the tape.The teacher may remind the students to pay attention to the meaning and usage of the black words in the context, so as to prepare for the completion of the blanks in activity 5 and vocabulary exercises in the exercise book.(2) Students complete the text of activity 5 by themselves.The teacher needs to remind the students to fill in the blanks with the correct form of the vocabulary they have learned in the text.Students exchange their answers with their partners, and then teachers and students check their answers.(3)Finish the Ex in Activity 5 of students’ book.Step 7 Homework1. Read the text again, in-depth understanding of the text;2. Discuss the origin of festivals, the historical changes of related customs, the influence of commercial society on festivals and the connotation and essential meaning of festivals.3. Complete relevant exercises in the guide plan.1、通過本節(jié)內(nèi)容學習，學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)容學習，學生能否結合文本特點快速而準確地找到主題句；3、通過本節(jié)內(nèi)容學習，學生能否理清論說文的語篇結構和文本邏輯，了解節(jié)日風俗發(fā)展與變遷，感悟節(jié)日的內(nèi)涵與意義。
新人教版高中英語必修3Unit 2 Morals and Virtues教學設計三
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)容學習，學生是否理解和掌握動詞-ing形式作賓語補足語語和狀語語的功能和意義；2、通過本節(jié)內(nèi)容學習，學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)容學習，學生能否獨立完成練習冊和導學案中的相關練習。
新人教版高中英語必修3Unit 2 Morals and Virtues教學設計二
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)容學習，學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)容學習，學生能否結合文本特點總結林巧稚的人生原則和人格品質特征；3、通過本節(jié)內(nèi)容學習，學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，進而對道德和人性有更加深入的思考和理解。
人教版新課標高中物理必修1彈力說課稿3篇
基于以上分析，為使本堂課圍繞重點、突破難點，同時讓學生在課堂教學中能力得到提高，我設計如下教學過程。（一）創(chuàng)設情景認識形變由同學們已有的形變知識入手，引入新課。教師演示：①彈簧的壓縮形變；②彈簧的拉伸形變③視頻播放：竹竿形變、鋼絲的扭轉形變。得出形變的概念及各類形變。[設計意圖：我從生活情景中引入新課，是為了激發(fā)學生的好奇心，為學生學習重點和難點內(nèi)容作鋪墊。]設問：摩天大樓在風的吹拂下會不會擺動，發(fā)生形變嗎？演示微小形變放大實驗：由于這種形變不容易觀察，會使學生產(chǎn)生疑問：到底有沒有發(fā)生形變？解決的辦法是微小形變的演示實驗。為什么光點會往下移？讓學生帶著問題思考后得出結論：是由于桌面發(fā)生了形變，但是形變不明顯。為后面解決壓力和支持力都是彈力做好鋪墊。[設計意圖：使學生知道“放大”是一種科學探究的方法。]
