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新人教版高中英語必修2Unit 4 History and Traditions-Reading and Thinking教案二
Step 5 While reading---Task 3Read the text again and answer the following questions.Q1: How many countries does the UK consist of ?4 Q2: What are the four countries of the United Kingdom?England, Wales, Scotland and Northern Ireland Q3: Which two were the first to be joined together ?England and WalesQ4: What are the two chief advantages of studying the history of a country ?The first one is to help you understand more about the country and its traditions.The second one is to make visiting it more enjoyable.Q5: What’s the author’s attitude towards studying the history ?Supportive/positiveStep 6 Post reading---Retell the textThe United Kingdom, Great Britain, Britain, England—many people are confused by (1)_____ these different names mean. In the 16th century, the nearby country of Wales (2) __________(join) to the Kingdom of England. In the 19 th century, the Kingdom of Ireland was added to create the United Kingdom of Great Britain and Ireland. Finally, the southern part of Ireland (3) ______ (break) away from the UK, which resulted in the full name we have today. However, most people just use the (4)_________(shorten) name: the UK. The four countries (5)__________ belong to the United Kingdom work together in some areas. There were four sets of invaders and the last group were the Normans. They had castles (6)_________(build) all around England and made changes (7)__________ the legal system. Studying the history of the country will make your visit much more (8)_________(enjoy). The capital city London is (9)___ ancient port city that has a history (10)______(date) back to Roman times. 1. what 2.was joined 3.broke 4.shortened 5.that 6. built 7.to 8.enjoyable 9.an 10.dating Step 6 Homework
新人教版高中英語必修2Unit 4 History and Traditions-Listening＆Speaking＆Talking教案二
Listening and Speaking introduces the topic of “Take part in a youth project”. The listening text is an interview about "sharing views on historical sites". Through listening to a dialogue between Chinese and foreign students on the way to the Confucius Temple, students can understand their views on the Confucius Temple, Confucius, Confucius' descendants and Confucius' educational thoughts, so as to realize and think about the profound influence of Confucius and his thoughts on Chinese historical tradition. At the same time, the dialogue naturally integrates English idioms and mentions Shakespeare, the British playwright, so as to provide language materials and context for students to understand English idioms and related cultural allusions, as well as to compare Chinese and foreign cultures, which is helpful for students to understand and express the language such as history, tradition, culture and custom significant impact.Text analysis: listening text is a dialogue between a British student and a Chinese student when he goes to the Confucius Temple. When William, a British student, visited the Confucius Temple, he asked Xiao Kong, a Chinese student, for directions. Xiao Kong was just going to the Confucius Temple to meet with the members of the research group, so they went together and exchanged their views on the Confucius Temple, Confucius, Confucius' descendants and Confucius' educational thoughts. From the perspective of foreign tourists, this paper describes their thoughts on Confucius, the great son of Confucius, who had a profound impact on Chinese history and cultural tradition, and his education.Listening and Talking introduces a visit to a historic tourist destination. Tourism is a common way to understand a country's history, culture, and customs and so on. Students listen to the dialogue between Xiao Yan, a youth hostel Usher, and Paul, a backpacker, to learn about Pingyao's famous historical and cultural attractions and Paul's travel experience and experience as a foreign tourist.
新人教版高中英語必修2Unit 4 History and Traditions-Reading and Thinking教案一
Features of languages1．Finally, in the 20th century, the southern part of Ireland broke away from the UK, which resulted in the full name we have today: the United Kingdom of Great Britain and Northern Ireland．該句是一個復合句。該句主句為：the southern part of Ireland broke away from the UK；which resulted in the full name we have today為which引導的定語從句代指前面整句話的內(nèi)容，we have today為定語從句修飾先行詞name。譯文：最后，在20世紀，愛爾蘭南部脫離英國，這導致了我們今天有的英國的全名：大不列顛及北愛爾蘭聯(lián)合王國。2．Almost everywhere you go in the UK, you will be surrounded by evidence of four different groups of people who took over at different times throughout history．該句是一個復合句。該句主句為：you will be surrounded by evidence of four different groups of people；其中Almost everywhere you go in the UK為讓步狀語從句； who took over at different times throughout history為定語從句修飾先行詞people。譯文：幾乎無論你走到英國的任何地方，你都會發(fā)現(xiàn)歷史上有四種不同的人在不同的時期統(tǒng)治過英國。3．The capital city London is a great place to start, as it is an ancient port city that has a history dating all the way back to Roman times．該句是一個復合句。該句主句為：The capital city London is a great place to start; as it is an ancient port city that has a history dating all the way back to Roman times．為原因狀語從句；dating all the way back to Roman times為現(xiàn)在分詞短語作定語修飾history。
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. 當被問及他為什么要這么做時, 班長說這是他的職責
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-Discovering Useful Structures教案一
Step1:自主探究。1．(教材P52)Born(bear) in the USA on 2 January 1970, Whitacre began studying music at the University of Nevada in 1988．2．(教材P52) Moved(move) by this music, he said, “It was like seeing color for the first time．”3．(教材P56)I was very afraid and I felt so alone and discouraged(discourage)．4．(教材P58)Encouraged(encourage) by this first performance and the positive reaction of the audience, I have continued to play the piano and enjoy it more every day．Step2:語法要點精析。用法1：過去分詞作表語1）．過去分詞可放在連系動詞be, get, feel, remain, seem, look, become等之后作表語，表示主語所處的狀態(tài)Tom was astonished to see a snake moving across the floor．湯姆很驚訝地看到一條蛇正爬過地板。Finally the baby felt tired of playing with those toys．終于嬰兒厭倦了玩那些玩具。注意：1）.過去分詞作表語時與被動語態(tài)的區(qū)別過去分詞作表語時，強調(diào)主語所處的狀態(tài)；而動詞的被動語態(tài)表示主語是動作的承受者，強調(diào)動作。The library is now closed．(狀態(tài))圖書館現(xiàn)在關閉了。The cup was broken by my little sister yesterday．(動作)昨天我妹妹把杯子打碎了。2）感覺類及物動詞的現(xiàn)在分詞與過去分詞作表語的區(qū)別過去分詞作表語多表示人自身的感受或事物自身的狀態(tài)，常譯作“感到……的”；現(xiàn)在分詞多表示事物具有的特性，常譯作“令人……的”。
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教案一
(4)Now we have heard a number of outstanding speeches ... 我們已經(jīng)聆聽了許多精彩的發(fā)言……(5)Because we wanted the nations of the world, working together, to deal with ... 因為我們希望全世界各國團結起來去應對……(6)And if we do not act ... 如果我們不采取行動……(7)Now, I share the concerns that have been expressed ... 我也同意對于……表達的擔心(8)Let us show the world that by working together we can ... 讓我們告訴全世界，通過一起努力我們可以……(9)It is now time for us to ... 是時候我們……(10)And I have always wished that ... 我一直希望……(11)Thank you for letting me share this day with me.感謝你們和我共度這一天。實踐演練：假如你是高中生李華，你校將舉辦一次以“音樂”為主題的演講比賽，請你按照主題，寫下你的演講稿。注意：詞數(shù)100左右。First of all, thank you for listening to my speech. My topic is: love music like love yourself.Music is like the air we need to maintain our normal lives around us. You can't imagine how terrible a world without music would be. Movies and TV shows have no music, only dry conversations and scenes; mobile phones only vibrations; streets only noisy crowds; cafes, western restaurants only depressed meals. What a terrible world it is!As a student, I hope we all can enjoy the fun brought by music in our spare time. Instead of just listening to music, we can even make our own music. Let's enjoy the fun of music!Thanks again for your attention!
人教A版高中數(shù)學必修一奇偶性教學設計（2）
《奇偶性》內(nèi)容選自人教版A版第一冊第三章第三節(jié)第二課時;函數(shù)奇偶性是研究函數(shù)的一個重要策略,因此奇偶性成為函數(shù)的重要性質(zhì)之一,它的研究也為今后指對函數(shù)、冪函數(shù)、三角函數(shù)的性質(zhì)等后續(xù)內(nèi)容的深入起著鋪墊的作用.課程目標1、理解函數(shù)的奇偶性及其幾何意義；2、學會運用函數(shù)圖象理解和研究函數(shù)的性質(zhì)；3、學會判斷函數(shù)的奇偶性．數(shù)學學科素養(yǎng)1.數(shù)學抽象：用數(shù)學語言表示函數(shù)奇偶性；2.邏輯推理：證明函數(shù)奇偶性；3.數(shù)學運算：運用函數(shù)奇偶性求參數(shù)；4.數(shù)據(jù)分析：利用圖像求奇偶函數(shù)；5.數(shù)學建模：在具體問題情境中，運用數(shù)形結合思想，利用奇偶性解決實際問題。重點：函數(shù)奇偶性概念的形成和函數(shù)奇偶性的判斷；難點：函數(shù)奇偶性概念的探究與理解．教學方法：以學生為主體，采用誘思探究式教學，精講多練。
人教A版高中數(shù)學必修一任意角教學設計（1）
本節(jié)課選自《普通高中課程標準數(shù)學教科書-必修一》（人 教A版）第五章《三角函數(shù)》，本節(jié)課是第1課時，本節(jié)主要介紹推廣角的概念,引入正角、負角、零角的定義，象限角的概念以及終邊相同的角的表示法。樹立運動變化的觀點,并由此進一步理解推廣后的角的概念。教學方法可以選用討論法,通過實際問題，如時針與分針、體操等等都能形成角的流念,給學生以直觀的印象,形成正角、負角、零角的概念,明確規(guī)定角的概念，通過具體問題讓學生從不同角度理解終邊相同的角,從特殊到一般歸納出終邊相同的角的表示方法。A.了解任意角的概念；B.掌握正角、負角、零角及象限角的定義，理解任意角的概念；C.掌握終邊相同的角的表示方法；D.會判斷角所在的象限。 1.數(shù)學抽象：角的概念；2.邏輯推理：象限角的表示；3.數(shù)學運算：判斷角所在象限；4.直觀想象：從特殊到一般的數(shù)學思想方法；
人教A版高中數(shù)學必修二簡單隨機抽樣教學設計
知識探究（一）：普查與抽查像人口普查這樣，對每一個調(diào)查調(diào)查對象都進行調(diào)查的方法，稱為全面調(diào)查（又稱普查）。 在一個調(diào)查中，我們把調(diào)查對象的全體稱為總體，組成總體的每一個調(diào)查對象稱為個體。為了強調(diào)調(diào)查目的，也可以把調(diào)查對象的某些指標的全體作為總體，每一個調(diào)查對象的相應指標作為個體。問題二：除了普查，還有其他的調(diào)查方法嗎？由于人口普查需要花費巨大的財力、物力，因而不宜經(jīng)常進行。為了及時掌握全國人口變動狀況，我國每年還會進行一次人口變動情況的調(diào)查，根據(jù)抽取的居民情況來推斷總體的人口變動情況。像這樣，根據(jù)一定目的，從總體中抽取一部分個體進行調(diào)查，并以此為依據(jù)對總體的情況作出估計和判斷的方法，稱為抽樣調(diào)查（或稱抽查）。我們把從總體中抽取的那部分個體稱為樣本，樣本中包含的個體數(shù)稱為樣本量。
人教A版高中數(shù)學必修一誘導公式教學設計（2）
本節(jié)主要內(nèi)容是三角函數(shù)的誘導公式中的公式二至公式六，其推導過程中涉及到對稱變換，充分體現(xiàn)對稱變換思想在數(shù)學中的應用，在練習中加以應用，讓學生進一步體會 的任意性；綜合六組誘導公式總結出記憶誘導公式的口訣：“奇變偶不變，符號看象限”，了解從特殊到一般的數(shù)學思想的探究過程，培養(yǎng)學生用聯(lián)系、變化的辯證唯物主義觀點去分析問題的能力。誘導公式在三角函數(shù)化簡、求值中具有非常重要的工具作用，要求學生能熟練的掌握和應用。課程目標1.借助單位圓，推導出正弦、余弦第二、三、四、五、六組的誘導公式，能正確運用誘導公式將任意角的三角函數(shù)化為銳角的三角函數(shù)，并解決有關三角函數(shù)求值、化簡和恒等式證明問題2.通過公式的應用，了解未知到已知、復雜到簡單的轉(zhuǎn)化過程，培養(yǎng)學生的化歸思想，以及信息加工能力、運算推理能力、分析問題和解決問題的能力。
人教A版高中數(shù)學必修一誘導公式教學設計（1）
一、復習回顧，溫故知新1. 任意角三角函數(shù)的定義【答案】設角 它的終邊與單位圓交于點 。那么（1） （2） 2.誘導公式一 ，其中， 。終邊相同的角的同一三角函數(shù)值相等二、探索新知思考1：（1）.終邊相同的角的同一三角函數(shù)值有什么關系?【答案】相等（2）.角 -α與α的終邊 有何位置關系?【答案】終邊關于x軸對稱（3）.角 與α的終邊 有何位置關系?【答案】終邊關于y軸對稱（4）.角 與α的終邊 有何位置關系?【答案】終邊關于原點對稱思考2： 已知任意角α的終邊與單位圓相交于點P(x, y),請同學們思考回答點P關于原點、x軸、y軸對稱的三個點的坐標是什么?【答案】點P(x, y)關于原點對稱點P1(-x, -y)點P(x, y)關于x軸對稱點P2(x, -y) 點P(x, y)關于y軸對稱點P3(-x, y)
人教A版高中數(shù)學必修一基本不等式教學設計（2）
《基本不等式》在人教A版高中數(shù)學第一冊第二章第2節(jié)，本節(jié)課的內(nèi)容是基本不等式的形式以及推導和證明過程。本章一直在研究不等式的相關問題，對于本節(jié)課的知識點有了很好的鋪墊作用。同時本節(jié)課的內(nèi)容也是之后基本不等式應用的必要基礎。課程目標1.掌握基本不等式的形式以及推導過程，會用基本不等式解決簡單問題。2.經(jīng)歷基本不等式的推導與證明過程，提升邏輯推理能力。3.在猜想論證的過程中，體會數(shù)學的嚴謹性。數(shù)學學科素養(yǎng)1.數(shù)學抽象：基本不等式的形式以及推導過程；2.邏輯推理：基本不等式的證明；3.數(shù)學運算：利用基本不等式求最值；4.數(shù)據(jù)分析：利用基本不等式解決實際問題；5.數(shù)學建模：利用函數(shù)的思想和基本不等式解決實際問題，提升學生的邏輯推理能力。重點：基本不等式的形成以及推導過程和利用基本不等式求最值；難點：基本不等式的推導以及證明過程．
人教A版高中數(shù)學必修一任意角教學設計（2）
學生在初中學習了 ～ ，但是現(xiàn)實生活中隨處可見超出 ～ 范圍的角.例如體操中有“前空翻轉(zhuǎn)體 ”，且主動輪和被動輪的旋轉(zhuǎn)方向不一致.因此為了準確描述這些現(xiàn)象，本節(jié)課主要就旋轉(zhuǎn)度數(shù)和旋轉(zhuǎn)方向?qū)堑母拍钸M行推廣.課程目標1.了解任意角的概念.2.理解象限角的概念及終邊相同的角的含義．3.掌握判斷象限角及表示終邊相同的角的方法．數(shù)學學科素養(yǎng)1.數(shù)學抽象：理解任意角的概念，能區(qū)分各類角；2.邏輯推理：求區(qū)域角；3.數(shù)學運算：會判斷象限角及終邊相同的角.重點：理解象限角的概念及終邊相同的角的含義；難點：掌握判斷象限角及表示終邊相同的角的方法．教學方法：以學生為主體，采用誘思探究式教學，精講多練。教學工具：多媒體。一、 情景導入初中對角的定義是：射線OA繞端點O按逆時針方向旋轉(zhuǎn)一周回到起始位置，在這個過程中可以得到 ～ 范圍內(nèi)的角.但是現(xiàn)實生活中隨處可見超出 ～ 范圍的角.例如體操中有“前空翻轉(zhuǎn)體 ”，且主動輪和被動輪的旋轉(zhuǎn)方向不一致.
人教版高中歷史必修3宋明理學教案2篇
二、程朱理學：1、宋代“理學”的產(chǎn)生：（1）含義：所謂“理學”，就是用“理學”一詞來指明當時兩宋時期所呈現(xiàn)出來的儒學。廣義的理學，泛指以討論天道問題為中心的整個哲學思潮，包括各種不同的學派；狹義的理學，專指程顥、程頤、朱熹為代表的，以“理”為最高范疇的學說，稱為“程朱理學”。理學是北宋政治、社會、經(jīng)濟發(fā)展的理論表現(xiàn)，是中國古代哲學長期發(fā)展的結果，是批判佛、道學說的產(chǎn)物。他們把“理”或“天理”視作哲學的最高范疇，認為理無所不在，不生不滅，不僅是世界的本原，也是社會生活的最高準則。在窮理方法上，程顥“主靜”，強調(diào)“正心誠意”；程頤“主敬”，強調(diào)“格物致知”。在人性論上，二程主張“去人欲，存天理”，并深入闡釋這一觀點使之更加系統(tǒng)化。二程學說的出現(xiàn)，標志著宋代“理學”思想體系的正式形成?！竞献魈骄俊克未袄韺W”興起的社會條件：
人教版新課標高中物理必修1彈力教案2篇
一般情況下，凡是支持物對物體的支持力，都是支持物因發(fā)生形變而對物體產(chǎn)生彈力。所以支持力的方向總是垂直于支持面而指向被支持的物體。例1：放在水平桌面上的書書由于重力的作用而壓迫桌面，使書和桌面同時發(fā)生微小形變，要恢復原狀，對桌面產(chǎn)生垂直于桌面向下的彈力f1，這就是書對桌面的壓力；桌面由于發(fā)生微小的形變，對書產(chǎn)生垂直于書面向上的彈力f2，這就是桌面對書的支持力。學生分析：靜止地放在傾斜木板上的書，書對木板的壓力和木板對書的支持力。并畫出力的示意圖。結論：壓力、支持力都是彈力。壓力的方向總是垂直于支持面而指向被壓的物體，支持力的方向總是垂直于支持面而指向被支持的物體。引導學生分析靜止時，懸繩對重物的拉力及方向。引導得出：懸掛物由于重力的作用而拉緊懸繩，使重物、懸繩同時發(fā)生微小的形變。重物由于發(fā)生微小的形變，對懸繩產(chǎn)生豎直向下的彈力f1，這是物對繩的拉力；懸繩由于發(fā)生微小形變，對物產(chǎn)生豎直向上的彈力f2，這就是繩對物體的拉力。
人教版新課標高中物理必修1摩擦力教案2篇
l．知識與技能：（1）知道摩擦力產(chǎn)生的條件。（2）能在簡單問題中，根據(jù)物體的運動狀態(tài)，判斷靜摩擦力的有無、大小和方向；知道存在著最大靜摩擦力。（3）掌握動磨擦因數(shù)，會在具體問題中計算滑動磨擦力，掌握判定摩擦力方向的方法。（4）知道影響到摩擦因數(shù)的因素。2．過程與方法：通過觀察演示實驗，概括出摩擦力產(chǎn)生的條件及摩擦力的特點，培養(yǎng)學生的觀察、概括能力。通過靜摩擦力與滑動摩擦力的區(qū)別對比，培養(yǎng)學生分析綜合能力。3．情感態(tài)度價值觀：在分析物體所受摩擦力時，突出主要矛盾，忽略次要因素及無關因素，總結出摩擦力產(chǎn)生的條件和規(guī)律。二、重點、難點分析1．本節(jié)課的內(nèi)容分滑動摩擦力和靜摩擦力兩部分。重點是摩擦力產(chǎn)生的條件、特性和規(guī)律，通過演示實驗得出關系f=μN。2．難點是學生有初中的知識，往往誤認為壓力N的大小總是跟滑動物體所受的重力相等，因此必須指出只有當兩物體的接觸面垂直，物體在水平拉力作用下，沿水平面滑動時，壓力N的大小才跟物體所受的重力相等。
人教版新課標高中物理必修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，且物體以勻速運動，則力對物體做功的功率保持不變。此情況下，任意一段時間內(nèi)的平均功率與任一瞬時的瞬時功率都是相同的。②很多動力機器通常有一個額定功率，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：當路面阻力較小時，牽引力也小，速度大，即汽車可以跑得快些；當路面阻力較大，或爬坡時，需要比較大的牽引力，速度必須小。這就是爬坡時汽車換低速擋的道理。③如果動力機器在實際功率小于額定功率的條件下工作，例如汽車剛剛起動后的一段時間內(nèi)，速度逐漸增大過程中，牽引力仍可增大，即F和v可以同時增大，但是這一情況應以二者乘積等于額定功率為限度，即當實際功率大于額定功率以后，這種情況不可能實現(xiàn)。
