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人教版高中語文必修5《指印》教案
一、明確目標(biāo)1．引導(dǎo)學(xué)生熟讀課文，理清文章的論述線索，抓住作者的主要觀點(diǎn)；2．通過學(xué)習(xí)，了解有關(guān)數(shù)學(xué)文化的一些知識(shí)；3．引導(dǎo)學(xué)生悉心體會(huì)作者對(duì)數(shù)學(xué)源頭的溯訪，感受其令人信服的推理能力和獨(dú)特的語言魅力；二、整體感知1．導(dǎo)入新課"屈指可數(shù)""彈指一揮見"，手指在生活中的計(jì)數(shù)功能，直接催生了數(shù)學(xué)這門科學(xué)，丹齊克的《指印》為我們揭開了這二者的關(guān)系（板書課題）。2．作者及相關(guān)背景介紹丹齊克（1884-1956），原籍立陶宛，曾在巴黎大學(xué)求學(xué)。1910年去美國(guó)，入美國(guó)國(guó)籍，先后在哥倫比亞大學(xué)、約翰·霍普金斯大學(xué)、馬里蘭大學(xué)講授數(shù)學(xué)。三、重點(diǎn)、難點(diǎn)的學(xué)習(xí)與目標(biāo)達(dá)成過程1．感知課文，明確本文的整體寫作思路。（1）學(xué)生讀課文，整理文章的結(jié)構(gòu)脈絡(luò)。（2）小組交流討論。
人教版高中語文必修4《雷雨》教案
節(jié)選部分結(jié)構(gòu):節(jié)選自第二幕，主要寫周樸園與魯家母子的對(duì)話，分兩部分。第一部分:三十年后周樸園和侍萍再次相見。第一層:侍萍以敘述別人故事的口吻，揭露周樸園的罪惡，訴說自己的遭遇。──寫他們過去的矛盾第二層:通過周樸園態(tài)度的變化，暴露他的偽善面目，表現(xiàn)侍萍這個(gè)勞動(dòng)?jì)D女的階級(jí)本色。──寫他們現(xiàn)在的矛盾第二部分:周樸園與魯大海父子、侍萍與周萍母子見面。通過周樸園和魯大海的激烈沖突，揭露周樸園壓榨工人的罪行，反映工人階級(jí)的反抗斗爭(zhēng)。分段依據(jù):第一部分從家庭生活方面來揭露周樸園；第二部分從社會(huì)生活方面來揭露周樸園。為了使周魯兩家三十年的新仇舊恨集中在一幕戲中得到反映，作者靈活地運(yùn)用了“回顧”的方法，把歷史和現(xiàn)實(shí)，過去和現(xiàn)在緊緊聯(lián)系起來了，用以刻畫人物性格，推動(dòng)劇情發(fā)展。
人教版高中語文必修3《錦瑟》說課稿
三、教學(xué)目標(biāo)根據(jù)《錦瑟》詩的地位作用以及學(xué)生的實(shí)際情況，還有在古詩詞教學(xué)方面課程標(biāo)準(zhǔn)的相關(guān)要求，現(xiàn)確定以下“三維教學(xué)目標(biāo)”：（一）知識(shí)與技能目標(biāo)：感受體悟古典詩歌的意境美，發(fā)揮合理的主觀能動(dòng)性進(jìn)行創(chuàng)新性的閱讀鑒賞，正確認(rèn)識(shí)意象在詩歌意境中的重要作用。并在上述的基礎(chǔ)上提高鑒賞能力和審美情操。（二）過程與方法目標(biāo)：《錦瑟》詩的講解采用“引導(dǎo)與自我生成”的方法，從老師的引導(dǎo)開始，以學(xué)生的研討交流再加之教師的總結(jié)結(jié)束。利用教師引導(dǎo)和師生互動(dòng)刺激學(xué)生的領(lǐng)悟力，提高學(xué)生的認(rèn)知水平與能力。（三）情感態(tài)度價(jià)值觀目標(biāo)：培養(yǎng)學(xué)生在尊重傳統(tǒng)文化的基礎(chǔ)上熱愛祖國(guó)自己文化的態(tài)度，讓學(xué)生正確認(rèn)識(shí)古典詩詞的精神美。最后在自我感悟中陶冶情操，明心啟智。
人教版高中英語必修1Earth quake說課稿
(4)Finally, I will ask the SS what this sentence mean：It is always calm before a storm.Purpose: attract the SS attention and bring them into discussionStep 2: Pre-reading 讀前Here, I will do the second question in pre-reading first. I will use the method of brainstorming to ask the SS what will happen before an earthquake; and list the phenomenon on the table. 2． Then I will show the SS the picture of abnormal phenomenon, at the same time, encourage the SS to describe.3、finally, I will summarize these phenomenon4、Do the first question in the pre-reading , Imaging your home begins to shake and you must leave it right away. You have time to take only one thing. What will you take? Why?Purpose: help the SS to get further understanding of the topic and stimulate their interests.Step3: While-reading 閱讀(1). Skimming Read the text quickly and catch the meaning of the first and second sentence of each paragraph. Predict the meaning of new words(2).scanning(找讀)A. Read the text again. Do the following question.1. When and where were the strange things happening?2. What are they?3. Why did the text say the world seemed to be at an end?4. How was the city destroyed after the quake?5. When did the second quake hit the city? What was the result of that?6. Who came to help Tangshan first? And how?B. Work in pairs to discuss the question.
新人教版高中英語必修2Unit 2 Wildlife Protection-Listening &Speaking＆Talking教案
Listening and Speaking introduces the topic of “how to save endangered wildlife and help wildlife in their neighborhood.” Due to the continuous deterioration of the living environment, a large number of wild animals are always facing the threat of endangered or extinction. Listening and speaking period enables students to understand the fact and reason why wild species are disappearing from the earth at an amazing speed, and realize that human beings ought to enhance the awareness of protecting wild species as soon as possible.Listening and Talking introduces the theme of " how to help wildlife in Ss’ neighborhood.". Now there are many volunteers who spontaneously protect wild animals, carry out various activities according to local conditions, and contribute their own strength to local animal protection with practical actions. Middle school students are also enthusiastic participants. They organize activities in their spare time, and take this opportunity to make friends, broaden their horizons, cultivate team spirit and communication skills. This section describes a bird watching activity organized by several middle school students of Bird watching Club. It aims to stimulate students' interest, improve their understanding of bird watching activities, and use the language structure of “being used for; in order to, so as to, to, so that, in order that ” to express the purpose for communication and discussion.1. Guide students to understand the content of listening texts in terms of using visuals to predict content.2. Cultivate students' ability to guess the meaning of words in listening; discuss with their peers how to save endangered wildlife and help wildlife in their neighborhood.3. Instruct students to use functional sentences of the dialogue such as “I am concerned about…” “what do you know about the endangered animals in…" and so on to talk about one of the endangered animals.
人教版高中語文必修2《采薇》教案2篇
這兩章是對(duì)戰(zhàn)爭(zhēng)場(chǎng)面的描寫。寫的是戰(zhàn)車、戰(zhàn)馬、象弭、魚服以及士兵的勞累奔波、饑渴難當(dāng)，通過這些具體生動(dòng)的細(xì)節(jié)描寫來展現(xiàn)戰(zhàn)爭(zhēng)生活的圖景。而沒有寫戰(zhàn)場(chǎng)上的刀光劍影、廝打拼殺，但戰(zhàn)爭(zhēng)的殘酷已可想見。4“昔我往矣，楊柳依依。今我來思，雨雪霏霏”被視為情景交融的佳句。清人王夫之在論《詩經(jīng)·小雅·采薇》這兩句時(shí)說：“以樂景寫哀，以哀景寫樂，一倍增其哀樂?！闭?wù)勀愕目捶āＲ灰酝糁撘r眼前之實(shí)，以出征之樂襯內(nèi)心之思親之悲痛；二“楊柳依依”與“雨雪霏霏”對(duì)比，突出不勝今昔之感；三大雪交加，饑渴難當(dāng)，情境實(shí)悲，以哀景寫哀情。四、交流延伸1寫一首詩或一段文字表達(dá)你對(duì)“鄉(xiāng)愁”的新的體驗(yàn)。在全班交流。2課后搜集更多的表現(xiàn)鄉(xiāng)情的詩歌散文作品，將你最感動(dòng)的一篇拿到班上與同學(xué)分享感受。
人教版高中語文必修2《涉江采芙蓉》教案2篇
三、想象畫面，把握意境1.指導(dǎo)想象學(xué)習(xí)陶淵明的《歸園田居》我們腦海中自然會(huì)出現(xiàn)一幅幅的畫面，比如他歸家后的生活場(chǎng)景，我們會(huì)想象“榆柳”是如何遮蔽房屋的，而“桃李”又是如何摘種在房前的。我們會(huì)想象村落是如何在薄霧中若隱若現(xiàn)的，想象炊煙是如何裊裊升起的?！渡娼绍饺亍芬辉娭挥?句話，更需要我們展開想象，去構(gòu)畫場(chǎng)景，這樣才能深入詩歌，體會(huì)到詩歌的味道。2.學(xué)生想象要求學(xué)生閉目想象1分鐘。3.學(xué)生展示想象結(jié)果（抽三四個(gè)學(xué)生回答即可）4.老師指導(dǎo)糾正學(xué)生想象不合理之處。要注意的地方：“江”可能學(xué)生會(huì)想象成小溪流、小池塘?！疤m澤”可能學(xué)生理解成“湖泊”。注意字詞“還顧”“漫浩浩”中隱含的情感，注意“離居”中流露的愁怨。5.時(shí)間允許的話，老師讀自己的下水作文。
人教版高中語文必修2《演講》教案2篇
一個(gè)世紀(jì)前，一位了不起的美國(guó)人簽署了奴隸解放宣言，而我們今天就站在他的塑像下面。對(duì)于千千萬萬身受不公正待遇之苦的黑奴來說，這份劃時(shí)代的文件，是一座光芒萬丈的希望燈塔，是結(jié)束他們被束縛之漫漫長(zhǎng)夜的快樂黎明。我有一個(gè)夢(mèng)，有朝一日在喬治亞州的丘陵地帶，奴隸的后代與奴隸主的后代，將能夠兄弟般地相處。我有一個(gè)夢(mèng)，有朝一日甚至密西西比州，這個(gè)充滿不平與壓迫的州，將轉(zhuǎn)化成一片自由與公正的綠洲。我有一個(gè)夢(mèng)，我的四個(gè)孩子，有朝一日將可以生活在這樣一個(gè)國(guó)度里：在此人們不是根據(jù)他們的膚色，而是根據(jù)他們的品行來衡量他們。我今天有一個(gè)夢(mèng)！我有一個(gè)夢(mèng)，有朝一日在阿拉巴馬州，盡管目前有許多惡毒的種族主義者，盡管州長(zhǎng)叫嚷著要與聯(lián)邦政府對(duì)抗，有朝一日在阿拉巴馬州，黑人孩子與白人孩子將會(huì)像兄弟姊妹那樣親密無間。
人教版高中語文必修2《孔雀東南飛并序》教案2篇
讓學(xué)生仔細(xì)聆聽美妙的音樂，合作討論，加深理解。（1）本詩文中的“蘭芝被遣”和“蘭芝抗婚”的情節(jié)，可與樂曲展開部第一階段“逼嫁抗婚”對(duì)比閱讀。文中的劉蘭芝是在封建禮教的壓迫下被遣歸及被迫“改嫁”，劉蘭芝與祝英臺(tái)一樣都進(jìn)行了抗?fàn)?。樂曲中的樂器奏出了具有威脅力的封建勢(shì)力的主題，代表著封建勢(shì)力的兇暴殘酷，同時(shí)敘述了祝英臺(tái)的悲痛和不安心情，表現(xiàn)了控訴、抗?fàn)幍母星?。?）本詩文中的“夫妻誓別”的情節(jié)，可與樂曲呈示部中的結(jié)束部“長(zhǎng)亭惜別”對(duì)比閱讀。文中劉蘭芝與焦仲卿的誓別。二人分手之際，依依不舍，“舉手長(zhǎng)勞勞，二情同依依”。樂曲中梁祝分別時(shí)依依不舍又充滿悲傷，音調(diào)抒情徐緩。讓學(xué)生在徐緩的音樂中去感受劉蘭芝與焦仲卿生離死別的痛苦。
人教版高中語文必修2《離騷》教案2篇
四、品味詩歌藝術(shù)1、詩人是如何表現(xiàn)其品質(zhì)的？運(yùn)用了什么修辭手法？產(chǎn)生了怎樣的表達(dá)效果？明確：詩句“扈江離與辟芷兮，紉秋蘭以為佩”很好地體現(xiàn)了詩人光輝俊潔的人格。用“江離”“辟芷”“秋蘭”三種香草來裝飾自己，比喻自己，極其生動(dòng)形象地表現(xiàn)了詩人自己美好的精神世界，使詩歌充滿了浪漫主義氣息。2、《離騷》中作者常以“香草”、“美物”來比喻自己、賢士和君王，并表達(dá)政治理想，這是《離騷》的一大藝術(shù)特色，這種方法叫做“移情法”，即不直接說出自己想說的話，而是把它寄寓于某一物上，也就是“移情于物”，這種方法在古典詩詞中廣泛運(yùn)用，在政治不清明的時(shí)代，借用“移情”，可言難言之語，抒難抒之情。請(qǐng)找出相關(guān)的詩句，說說詩人是怎樣運(yùn)用這些比喻來表達(dá)政治理想的。
人教版高中語文必修2《囚綠記》教案2篇
教學(xué)設(shè)想：本節(jié)課的主題是“生命之綠，璞玉心靈”，用圈點(diǎn)批注法解讀愛綠的感情，讓學(xué)生在批注中明確“綠”的象征意義，而不只是結(jié)論的傳遞。同時(shí)借助于閱讀、感受和理解把握作者對(duì)綠的認(rèn)識(shí)是不斷升華的，由一般對(duì)生命希望之綠的喜愛，到與綠交往后被它的不畏強(qiáng)暴，永遠(yuǎn)向陽的精神所折服，最后在特定的時(shí)代背景下綠在作者的心目中已經(jīng)成了我們民族不屈精神的象征。讓學(xué)生評(píng)中求解，評(píng)中悟情，評(píng)中明理，評(píng)中品味。教學(xué)進(jìn)程:一、導(dǎo)語上節(jié)課我們學(xué)習(xí)了朱自清的《綠》，初步了解了讀書動(dòng)筆的基本方法，這節(jié)課我們繼續(xù)用圈點(diǎn)批注的方法來學(xué)習(xí)陸蠡的散文《囚綠記》。二、釋題師：看標(biāo)題，囚綠之“綠”在文中具體指什么？（一株常春藤）“囚”就是囚禁的意思，那題目就是記述囚禁綠色常春藤的經(jīng)過。三、圈點(diǎn)、把握情節(jié)作者為什么要囚綠呢？文中除了寫“囚綠”之外，還寫了哪些有關(guān)綠的意念和行動(dòng)？帶著這樣的質(zhì)疑用自己喜歡的方式朗讀課文，請(qǐng)同學(xué)們?nèi)c(diǎn)出疑難字詞，或結(jié)合書下注釋，或同學(xué)合作解決，解決不了的，可提出來我們共同解決。標(biāo)注段落節(jié)次。勾畫出表現(xiàn)作者對(duì)綠意念和行動(dòng)的句子。
人教版高中語文必修2《巴黎圣母院》教案2篇
【教學(xué)設(shè)想】一、選題設(shè)想《巴黎圣母院》是雨果的代表作，無論從思想內(nèi)容還是藝術(shù)風(fēng)格都有明顯的浪漫主義特征：奇異曲折、扣人心弦的故事情節(jié)；妙趣橫生、別出心裁的奇遇巧合；強(qiáng)烈鮮明的美丑、善惡對(duì)比；豐富生動(dòng)、珠璣迸發(fā)、富有哲理意味的語言。通過導(dǎo)讀，來消除學(xué)生對(duì)外國(guó)名著的畏難情緒，增加學(xué)生課外閱讀的興趣和信心；讓學(xué)生整體把握作品，窺一斑而識(shí)全豹，讓學(xué)生高屋建瓴，了解其旨意，以極為精確而又充滿意蘊(yùn)的文字，對(duì)名著的概述及精要部分做了介紹；引導(dǎo)學(xué)生自主探究，交流合作，培養(yǎng)學(xué)生的獨(dú)立思考的學(xué)習(xí)慣，指點(diǎn)進(jìn)行名著閱讀的門徑。作為導(dǎo)讀課，教師應(yīng)注意不可“越位”，在學(xué)生學(xué)習(xí)的過程中，教師的“導(dǎo)”固然重要，學(xué)生的“讀”更不可或缺，應(yīng)避免以“導(dǎo)讀”來代替名著閱讀。因此，《巴黎圣母院》的教學(xué)定位為基于課內(nèi)，面向課外，以求達(dá)到以學(xué)帶讀，以讀促學(xué)的目的。
人教版高中語文必修2《短歌行》教案2篇
教學(xué)過程：一、導(dǎo)語毛澤東在《沁園春雪》俯視封建君王“惜秦皇漢武。。。只識(shí)彎弓射大雕。”但如果歷史上只有一個(gè)人可以與他相提并論，這個(gè)人只能是魏武帝曹操?！皾L滾長(zhǎng)江東逝水，浪花淘盡英雄。是非成敗轉(zhuǎn)頭空，青山依舊在，幾度夕陽紅?！保ā度龂?guó)演義》卷首詞）在歷史的大浪淘沙中，有多少英雄能夠經(jīng)得起歷史的千淘萬漉而流芳百世呢？曹操應(yīng)該是三國(guó)時(shí)代留下了濃重一筆的人物。老師總結(jié)，并啟發(fā)他們?nèi)ヂ?lián)系:我們學(xué)過他的《觀滄?！贰皷|臨碣石,以觀滄?！边€有《龜雖壽》“神龜雖壽，猷有竟時(shí)。老驥伏櫪，志在千里；烈士暮年，壯心不已?！薄肚嗝分鬄⒄撚⑿邸分性退娺^，《三國(guó)演義》電視劇播出后，大家和他也就頻頻見面了?！度龂?guó)演義》第48回“宴長(zhǎng)江曹操賦詩”中，赤壁之戰(zhàn)前夕，曹操和眾部將一起狂飲，他四顧空闊，心中大喜，與諸將講述自己希望收服江南的雄心壯志。
新人教版高中英語必修2Unit 2 Wildlife Protection-Reading for Writing教案二
This lesson aims at making a poster about protecting wildlife after reading some posters. During reading students are guided to understand the content and try to summarize the posters with one sentence. Then students are guided to try to make a poster about protecting wildlife.1. Read the two posters and try to understand the summary sentences.2. Look at the two posters and try to understand what emotions they express.3. Try to summarize the features of posters4. Try to make a poster about wildlife.1. Look at the two posters and try to understand what emotions they express.2. Try to summarize the features of posters3. Try to make a poster about wildlife.Step 1 Lead inLook at the the posters on the textbook and ask:Which emotions do the posters communicate ?Step 2 Read the poster and answer the questions.1. What do you think of the animals in the poster on the left ?I think it is frightening and ugly.2. Why do we should protect the ugly animals ?All species--the good, the bad, and the ugly-- should be treated equally.The world needs all kinds--without variety, our planet cannot survive.3. Why are billions of trees being cut down every year ?To make paper for humans.4. What result will be lead to after the trees are cut down ?A lost of animal homes are being destroyed./The habitat of wildlife is being destroyed.Step 3 Find the feature of posters1. What does each poster use to stir up emotions ?On the left, it makes us a little frightened and it looks a little ugly, but it can activate our curiosity--What is it? And What is wrong with it?On the right, it makes us feel a little sad and want to protect them.
新人教版高中英語必修2Unit 2 Wildlife Protection-Discovering Useful Structure教案二
2．表示現(xiàn)階段正在進(jìn)行的被動(dòng)動(dòng)作(該動(dòng)作在說話的瞬間未必正在進(jìn)行)。Many interesting experiments are being carried out these days.(說話時(shí)，并不一定正在進(jìn)行)3．表示一種經(jīng)常性的被動(dòng)行為，常和always，constantly 等表示頻度的副詞連用，這種用法常常帶有贊揚(yáng)或厭惡的感情色彩。He is always being praised by the leader.4．表示按計(jì)劃或安排主語將要承受謂語動(dòng)詞所表示的動(dòng)作(僅限于少數(shù)及物動(dòng)詞)。A party is being held tonight.Step 4 Special cases1.像take care of, look after, talk about, think of等動(dòng)詞與介詞構(gòu)成的短語用于現(xiàn)在進(jìn)行時(shí)的被動(dòng)語態(tài)時(shí), 其中的介詞不可省略。The ways to stop illegally hunting are being talked about. 2．可與部分情態(tài)動(dòng)詞連用，表示對(duì)正在發(fā)生的事情的推測(cè)。She may be being punished by her mother.3．有時(shí)可表示按計(jì)劃或安排將要進(jìn)行的一個(gè)被動(dòng)動(dòng)作。A celebration is being held this weekend for his success.4．某些表示“狀態(tài)、心理活動(dòng)、存在”等的動(dòng)詞，如have，want，need，love，一般不用現(xiàn)在進(jìn)行時(shí)的被動(dòng)語態(tài)，而常用一般現(xiàn)在時(shí)的被動(dòng)語態(tài)。With the population increasing，more land is needed.5．“be＋under/in＋n.”可表示現(xiàn)在進(jìn)行時(shí)的被動(dòng)意義。My computer is under repair.＝My computer is being repaired.
新人教版高中英語必修2Unit 2 Wildlife Protection-Listening and Speaking教案
This lesson is about wildlife protection. The listening and speaking is about “How to protect endangered wildlife ?” Faced with the facts and numbers of wildlife loss, people begin to detect the reasons, then people such as the celebrities (Prince William and Yao Ming) are calling on to protect them. So students are guided to enhance the awareness of protecting wildlife and try to take part in some volunteer activities of protecting wildlife.1. Predict the content by using visuals. 2. Learn to use the sentences such as “I’m concerned about.... But now they are in danger. I want to know the reasons/why./ What can we do to protect them ?3. Learn from the stars like Prince William and Yao Ming and enhance the awareness of protecting wildlife.4. Guide students to try to put forward the solutions to the problems of wildlife protection and then discuss them with partners and present the results of discussion.5. Master the pronunciation of stressed syllables.1. Learn from the stars like Prince William and Yao Ming and enhance the awareness of protecting wildlife.2. Guide students to try to put forward the solutions to the problems of wildlife protection and then discuss them with partners and present the results of discussion.3. Learn to use the sentences such as “I’m concerned about.... But now they are in danger. I want to know the reasons/why./ What can we do to protect them ?4. Master the pronunciation of stressed syllables.Part A Listening and Speaking--- How to save endangered wildlifeStep 1 Lead in1. Point at the pictures on P14 and ask Q1: What message do these posters share?
新人教版高中英語必修2Unit 2 Wildlife Protection-Reading and Thinking教案二
The theme of this unit is human and nature, focusing on the theme of wildlife protection. Nature is a complex ecosystem, in which there are delicate balance between animals and plants. Because of the role of the food chain, the extinction of one species will produce influence, causing a series of chain reaction. Large scale extinction of species will have a serious and even irreversible impact on the ecosystem, resulting in immeasurable losses. Therefore, it is of great significance to protect wild species. To protect wild species is to protect human beings themselves. The motto of this unit is "when the buying stops, the killing can too,” which is a public service advertising slogan to protect wildlife. It tells people that every rhinoceros horn, every fur, every bowl of shark fin soup, every Ivory product, and every tiger bone product, etc. consumed by human beings, are innocent wild animals slaughtered behind them. The mission of wild aid is to ban illegal trade in endangered wildlife and mitigate climate change. It aims to educate the public to reduce the consumption demand for endangered wildlife products through public publicity and improve the awareness of environmental protection.1. Improve the awareness of wildlife protection by acquiring the knowledge of wildlife protection.2. Focus on environmental protection and protection of all lives.3. Analysis of the living environment of wild animals with appropriate thinking mode.4. Skillfully use the vocabulary and grammar knowledge of this unit to cultivate self-study ability according to the unit content5. Develop cooperative learning ability through discussion and other ways1. Enable the Ss to talk about the current situation of wild animals.2. Guide the Ss to summarize the main idea of each paragraph as well as the main idea of the text.
人教版新課標(biāo)高中物理必修2功率教案2篇
1．用CAI課件模擬汽車的啟動(dòng)過程。師生共同討論：①如果作用在物體上的力為恒力，且物體以勻速運(yùn)動(dòng)，則力對(duì)物體做功的功率保持不變。此情況下，任意一段時(shí)間內(nèi)的平均功率與任一瞬時(shí)的瞬時(shí)功率都是相同的。②很多動(dòng)力機(jī)器通常有一個(gè)額定功率，且通常使其在額定功率狀態(tài)工作（如汽車），根據(jù)P=FV可知：當(dāng)路面阻力較小時(shí)，牽引力也小，速度大，即汽車可以跑得快些；當(dāng)路面阻力較大，或爬坡時(shí)，需要比較大的牽引力，速度必須小。這就是爬坡時(shí)汽車換低速擋的道理。③如果動(dòng)力機(jī)器在實(shí)際功率小于額定功率的條件下工作，例如汽車剛剛起動(dòng)后的一段時(shí)間內(nèi)，速度逐漸增大過程中，牽引力仍可增大，即F和v可以同時(shí)增大，但是這一情況應(yīng)以二者乘積等于額定功率為限度，即當(dāng)實(shí)際功率大于額定功率以后，這種情況不可能實(shí)現(xiàn)。
人教版新課標(biāo)高中物理必修2平拋運(yùn)動(dòng)教案2篇
（五）平拋運(yùn)動(dòng)規(guī)律的應(yīng)用例1：一架老式飛機(jī)在高出海面45m的高處，以80m/s的速度水平飛行，為了使飛機(jī)上投下的炸彈落在停在海面上的敵船，應(yīng)該在與轟炸目標(biāo)的水平距離為多遠(yuǎn)的地方投彈?不計(jì)空氣阻力。分析：對(duì)于這道題我們可以從以下幾個(gè)方面來考慮：(1)從水平飛行的飛機(jī)上投下的炸彈，做什么運(yùn)動(dòng)?為什么?(2)炸彈的這種運(yùn)動(dòng)可分解為哪兩個(gè)什么樣的分運(yùn)動(dòng)?3)要想使炸彈投到指定的目標(biāo)處，你認(rèn)為炸彈落地前在水平方向通過的距離與投彈時(shí)飛機(jī)離目標(biāo)的水平距離之間有什么關(guān)系?拓展：1、式飛機(jī)在高出海面45m的高處，以80m/s的速度水平飛行，尾追一艘以15m/s逃逸的敵船，為了使飛機(jī)上投下的炸彈正好擊中敵船，應(yīng)該在與轟炸目標(biāo)的水平距離為多遠(yuǎn)的地方投彈?不計(jì)空氣阻力。2、在一次摩托車跨越壕溝的表演中，摩托車從壕溝的一側(cè)以速度v＝40m/s沿水平方向向另一側(cè)，壕溝兩側(cè)的高度及寬度如圖所示，摩托車可看做質(zhì)點(diǎn)，不計(jì)空氣阻力。（1）判斷摩托車能否跨越壕溝？請(qǐng)計(jì)算說明（2）若能跨過，求落地速度？
人教版新課標(biāo)高中物理必修2向心力教案2篇
3．進(jìn)一步體會(huì)力是產(chǎn)生加速度的原因，并通過牛頓第二定律來理解勻速圓周運(yùn)動(dòng)、變速圓周運(yùn)動(dòng)及一般曲線運(yùn)動(dòng)的各自特點(diǎn)。（三）、情感、態(tài)度與價(jià)值觀1．在實(shí)驗(yàn)中，培養(yǎng)學(xué)生動(dòng)手、探究的習(xí)慣。2．體會(huì)實(shí)驗(yàn)的意義，感受成功的快樂，激發(fā)學(xué)生探究問題的熱情、樂于學(xué)習(xí)的品質(zhì)。教學(xué)重點(diǎn)1．體會(huì)牛頓第二定律在向心力上的應(yīng)用。2．明確向心力的意義、作用、公式及其變形，并經(jīng)行計(jì)算。教學(xué)難點(diǎn)1．對(duì)向心力的理解及來源的尋找。2．運(yùn)用向心力、向心加速度的知識(shí)解決圓周運(yùn)動(dòng)問題。教學(xué)過程（一）、 引入新課：復(fù)習(xí)提問：勻速圓周運(yùn)動(dòng)的物體的加速度——向心加速度，它的方向和大小有何特點(diǎn)呢？學(xué)生回答后進(jìn)一步引導(dǎo)：那做勻速圓周運(yùn)動(dòng)物體的受力有什么特點(diǎn)呢？是什么力使物體做圓周運(yùn)動(dòng)而不沿直線飛出？請(qǐng)同學(xué)們先閱讀教材