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高中物理必修二圓周運動教案
1、知識與技能 (1)認識勻速圓周運動的概念，理解線速度的概念，知道它就是物體做勻速圓周運動的瞬時速度;理解角速度和周期的概念，會用它們的公式進行計算; (2)理解線速度、角速度、周期之間的關系：v=rω=2πr/T; (3)理解勻速圓周運動是變速運動?！ ?、過程與方法 (1)運用極限法理解線速度的瞬時性.掌握運用圓周運動的特點如何去分析有關問題; (2)體會有了線速度后.為什么還要引入角速度.運用數(shù)學知識推導角速度的單位。
人教版高中英語必修2Computers說課稿3篇
一. 教材分析1. 本單元的中心話題是“計算機（Computers）”，內(nèi)容涉及計算機的發(fā)展歷史，計算機的應用等。本節(jié)課是該單元的第一課時，我將Warming up, Pre-reading and Comprehending這四部分整合為一節(jié)精讀課。其中。Reading部分是題為WHO AM I？的文章，以第一人稱的擬人手法介紹了計算機發(fā)長演變的歷史和計算機在各個領域的應用，其主旨是表達計算機的發(fā)展變化之快以及在生活中用途之廣。而Warming up部分以圖片的形式展現(xiàn)了計算機的發(fā)展歷程；Pre-reading中的問題和排序分別是為了預測語篇的內(nèi)容和測試學生對計算機歷史了解的情況；Comprehending則通過各項練習訓練學生的閱讀技能，從而加深對文章的理解。可見這幾部分是一個有機的整體。2. 教學目標：1) 語言目標：重點詞匯及短語：abacus, calculate, calculator, PC, laptop, PDA, robot, analytical, technological, universal, mathematical, artificial, intelligent, network, explore, in common, as a result.重點句子：a. My real father was Alan Turing, who in 1963 wrote a book to describe how computers could be made to work, and build a “universal machine” to solve any mathematical problem.
人教版高中英語必修2Wildlife Protection說課稿3篇
When it comes to the students’ studying methods, I'd like to introduce my Ss first. The Ss have a good command of basic language points. They’re interested in learning English, and they take an active part in English class, so they will have fun in autonomous, cooperative and inquiry learning. I will just serve as a guide, showing them the way to explore how to make more progress in their English learning.Now it’s time for the most important stage of this lesson. My teaching procedures are arranged as follows:Step1.Leading-in (3 minute)Play a video of a wide variety of wildlife to introduce my topic. Step2. Speaking (12 minutes)We will use our textbook Page25. Let the Ss fast read the short paragraph to warm up. Ask them to talk about the report on some endangered wildlife in China with the dialogue patterns on the screen. Lastly, I will invite some groups to demonstrate their dialogues about saving wildlife in China.Step3.English play (3 minutes)Watch another video in praise of their excellent performance just now. It’s about Jack Chen’s（成龍）and Yang Ziqiong’s wildlife protection.Step4. Listening (twice 13 minutes)This time, I’ll ask the Ss to fill in the blanks of the monologue of the 2 movie stars above. Step5.Discussion (3 minutes)Which would you like to choose to wear, clothes made of cotton, artificial leather or animal skins? Why ?Step6. Summary (3 minutes)1. If there were no wildlife, there wouldn’t exist human beings. If the buying stops, the killing can, too.2. Animals are our friends. To love animals is to love ourselves. Stop hunting, killing and destroying wildlife.3. Let’s live in harmony with all the living things in the world. Step7. Music appreciation (3 minutes)Let the Ss appreciate the song Earth Song by Michael Jackson. Last but not the least, I will show you my blackboard design.
人教版高中歷史必修3宋明理學說課稿3篇
陸王心學與程朱理學相比有何異同？生 不同點：在理的內(nèi)涵上不同，程朱理學認為“理”是貫通于宇宙、人倫的客觀存在，是一種普遍的規(guī)律準則；陸王心學認為心即理，是“良知”，認為人心便是世界萬物的本原。方法上也有不同：前者向外追究，“格物致知”；后者向內(nèi)探求，“發(fā)明本心”以求理，克服私欲、回復良知。生 相同點：都提出了一個宇宙、社會、人生遵循的“理”。師 對。程朱理學是客觀唯心主義，陽明心學是主觀唯心主義。這兩者的分歧是理學范圍內(nèi)的分歧，其基本思想是一致的。師 宋明理學與漢唐以前的儒學比較，最大的特點在于批判地吸收了佛教哲學的思辨結(jié)構(gòu)和道教的宇宙生成論，將儒家的倫理學說概括升華為哲學基本問題。其實質(zhì)是把佛、道“養(yǎng)性”“修身”引向儒家的“齊家”“治國”“平天下”，對儒家的綱常道德給予哲學論證，使之神圣化、絕對化、普遍化，以便深入人心，做到人人遵而行之。
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(jié)合文本特點了解文章的結(jié)構(gòu)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 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?qū)⒁H歷不同的慶?；顒?。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(jié)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(jié)構(gòu)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。
人教版高中歷史必修3輝煌燦爛的文學說課稿
教師：不同的時代造就了不同風格和不同精神內(nèi)容的詩詞，請同學們回顧必修一和必修二兩宋中央集權(quán)的加強和經(jīng)濟的發(fā)展狀況。學生：回憶回答。教師：請同學們結(jié)合時代背景和詞的特點理解詞為什么能夠成為宋代文學的主流形式和標志？學生：兩宋時經(jīng)濟重心轉(zhuǎn)移到了南方，商業(yè)發(fā)展打破了時間和空間的限制，城市繁榮，市民數(shù)量不斷增加。詞的句子長短不齊，便于抒發(fā)感情，并且能夠歌唱，更能適應市井生活的需要。于是，詞成為宋代文學的主流形式和標志。教師：宋代文人地位提高，宋詞就是一個個時代的畫卷：大宋的悲歡離合都寫在了里面。除了詞之外，宋代民間還興起了一種新的詩歌形式，即散曲。學生：回答散曲的發(fā)展階段及特點、元曲的含義、特點。教師：在中國古代詩歌輝煌發(fā)展的同時，也產(chǎn)生了供人們閑來無事消遣的小說。
人教版新課標高中地理必修2第五章第一節(jié)交通運輸方式和布局教案
（2）修建通向西藏的鐵路，要克服哪些自然障礙？①凍土的季節(jié)凍融作用使路基不穩(wěn)固，也使修路技術難度大，成本高②生態(tài)脆弱，植被破壞后難以修復③高原缺氧，使施工困難④廣布的荒漠，多山的地形都使建設難度加大（3）結(jié)合初中所學知識分析，未來穿行于青藏高原鐵路運輸線上的貨車中主要運輸?shù)呢浳镉心男?？以鹽湖中礦物為原料的化工產(chǎn)品，有色金屬及其加工產(chǎn)品，畜產(chǎn)品及外省運入的各種工業(yè)品等?！究偨Y(jié)新課】交通運輸網(wǎng)的基本要素包括：交通線（鐵路、公路、航道、管道）和交通點（港口、車站、航空港）；運輸網(wǎng)有單一和綜合運輸網(wǎng)二種形式。分國家級、省級和大區(qū)級三個層次。交通運輸網(wǎng)的點線布局受經(jīng)濟、社會、技術和自然等因素的影響?！菊n后作業(yè)】：完成高一地理第二冊填圖冊 第五章第一節(jié)
精編教師個人新課標學習心得體會優(yōu)選例文
我將根據(jù)新的語文能力實踐系統(tǒng)，致力于學生語文綜合素質(zhì)的提高，促進語文課程的呈現(xiàn)方式和學生學習方式的轉(zhuǎn)變，確立學生在學習中的主體地位，努力給學生創(chuàng)造一個有利于素質(zhì)教育的空間?！ τ谛W語文教學來說，既要轉(zhuǎn)變教的方式又要轉(zhuǎn)變學的方式，培養(yǎng)和形成“自主、合作、探究”的學習方式，在這兩個轉(zhuǎn)變中，教的方式轉(zhuǎn)變是主要矛盾。教的方式一轉(zhuǎn)變，學的方式也隨之轉(zhuǎn)變。學的方式轉(zhuǎn)變可以理情地在課堂中呈現(xiàn)，證明教的方式轉(zhuǎn)變，證明教師新理念的真正樹立。課改實踐告訴我們，沒有堅定的新課程理念，真正意義上的教與學方式的轉(zhuǎn)變是不可能的。把課標學習與教材教法研究結(jié)合起來：要鉆研新教材，理解和把握新教材，用好新教材，要重視教學反思，個案研究和收集，要牢記驗證課標和檢驗教材的實驗任務。
八篇個人學習國防安全教育心得體會參考例文
國防隨著國家的產(chǎn)生而產(chǎn)生，國家的興衰和國防密切相關，因為過分的強弱直接關系到國家的安全、民族的尊嚴及社會的發(fā)展。 地球是我們?nèi)祟惞餐奈ㄒ患覉@，我們要心連著心，手牽著手去保護我們的家園，最重要的是世界的和諧、穩(wěn)定，而決定世界是否和諧、穩(wěn)定地發(fā)展的決定因素是國與國之間是否和平發(fā)展，以及人與人之間是否和睦相處?！ ∮羞@么一句話“要想別人尊重你，你首先要尊重別人”。國家與國家的發(fā)展如果想和平的進行，首先這兩個國家必須互相尊重，不用為了擴大自己的領土，爭奪不屬于自己的資源，而使用霸權(quán)主義進行軍事威脅，或者擴大軍事集團，強化軍事同盟。相反的，一個國家應該擁有一顆寬容、善良的心，對需要幫助的國家伸出援助之手，為大家的共同利益而奮斗！
關于個人學習紅色文化教育心得體會八篇
古鎮(zhèn)總有那么一股特殊魅力，時光在這里就這么一步一隱退，千年時光，依舊歲月靜好。恩陽古鎮(zhèn)，坐落于川東北地區(qū)的革命老區(qū)巴中市恩陽區(qū)，東臨巴中市區(qū)。有28條古街，數(shù)百座明清古建筑。走在李先念、徐向前等老一輩無產(chǎn)階段革命家們同樣踏過足跡的古鎮(zhèn)道路上，看著那一句句振奮人心的石刻標語和一處處紅四方面軍各個職能部門的遺址。我仿佛穿越回到了那個激情與信仰純粹的年代，物質(zhì)條件雖然很艱苦，但是因為共同的信仰，為了共同的目標，大家眾志成城，艱苦奮斗。這也許就是紅色教育的關鍵意義所在，那種歷史的精神在古跡中能跨越時空的限制傳遞到現(xiàn)在的人身上?？粗y行、法庭、學校、等各個地方，我知道無論戰(zhàn)爭與和平年代，制度的健全是至關重要的，依法治國是國家強大富強的保證。
大班數(shù)學活動：學習7的加法課件教案
2、理解交換規(guī)律，懂得運用互換規(guī)律列出另一道算式。3、積極探索數(shù)學活動，樂于講述探索結(jié)果。活動準備：1、教具：城堡圖一副（分為三層，每一層分別有表示7的加法的三副圖，用紙覆蓋）、水果單一張。2、學具：城堡圖人手一份、水果單人手一張?；顒又攸c：看圖學習7的加法活動難點：能根據(jù)不同的畫面進行講述，并列出相應的算式活動過程：一、開火車：復習7的組成師：城堡王國的國王邀請我們?nèi)ニ膰彝?，你們愿意嗎？那讓我們快點乘上7次列車（出示數(shù)字7）出發(fā)吧。師：嘿嘿，我的火車X（1）點開，你的火車X 點開？幼：嘿嘿，我的火車X（1）點開，我的火車X（6）點開。
大班數(shù)學活動《學習6—9的相鄰數(shù)》課件教案
２、學習與同伴友好交往、合作游戲的方法。３、培養(yǎng)幼兒的動手操作能力、遷移能力和逆向思維?；顒訙蕚洌?1—10數(shù)字一套；錄音帶、錄音機；幼兒學具： 1—10的紙牌?；顒宇A設：1、游戲《拍手問答》復習5以內(nèi)的相鄰數(shù)。教師邊拍手邊問，幼兒邊拍手邊回答。如教師問：小朋友，我問你，3的朋友是幾和幾？幼兒回答：x老師，告訴你，3的朋友是2和4。（可請個別或集體回答）2、游戲《認鄰居》：請若干幼兒自選樓房居住，并認識自己的鄰居。學習6的相鄰數(shù)。知道其與前后數(shù)的關系。3、游戲：紙牌樂，兩個幼兒為一組。游戲開始，把1—10的紙牌放在桌面上，兩個幼兒猜“剪刀石頭布”，贏幼兒先取一張紙牌，輸?shù)挠變赫页鏊南噜彅?shù)。游戲再次進行，教師巡回指導。
人教版高中政治必修1信用工具和外匯說課稿
一、對教材內(nèi)容的處理根據(jù)新課程標準的要求、知識的跨度、學生的認知水平，我對教材內(nèi)容有增有減。二、教學策略的選用（一）運用了模擬活動，強化學生的生活體驗,本框題知識所對應的經(jīng)濟現(xiàn)象，學生已具有了一定的生活體驗，但是缺乏對這種體驗的深入思考。因此在進一步強化這種體驗的過程中進行了思考和認知，使知識從學生的生活體驗中來，從學生的思考探究中來，有助于提高學生的興趣，有助于充分調(diào)動學生現(xiàn)有的知識，培養(yǎng)學生的各種能力，也有助于實現(xiàn)理論知識與實際生活的交融。（二）組織學生探究知識并形成新的知識我從學生的生活體驗入手，運用案例等形式創(chuàng)設情境呈現(xiàn)問題，使學生在自主探索、合作交流的過程中，發(fā)現(xiàn)問題、分析問題、解決問題，在問題的分析與解決中主動構(gòu)建知識。也正是由于這些認識來自于學生自身的體驗，因此學生不僅“懂”了，而且“信”了。從內(nèi)心上認同這些觀點，進而能夠主動地內(nèi)化為自己的情感、態(tài)度、價值觀，并融入到實踐活動中去，有助于實現(xiàn)知、行、信的統(tǒng)一。
人教版新課標高中物理必修1用牛頓運動定律解決問題（一）教案2篇
（四）實例探究☆力和運動的關系1、一個物體放在光滑水平面上，初速為零，先對物體施加一向東的恒力F，歷時1秒，隨即把此力改變?yōu)橄蛭?，大小不變，歷時1秒鐘，接著又把此力改為向東，大小不變，歷時1秒鐘，如此反復只改變力的方向，共歷時1分鐘，在此1分鐘內(nèi)A．物體時而向東運動，時而向西運動，在1分鐘末靜止于初始位置之東B．物體時而向東運動，時而向西運動，在1分鐘末靜止于初始位置C．物體時而向東運動，時而向西運動，在1分鐘末繼續(xù)向東運動D．物體一直向東運動，從不向西運動，在1分鐘末靜止于初始位置之東☆牛頓運動定律的應用2、用30N的水平外力F，拉一靜止放在光滑的水平面上質(zhì)量為20kg的物體，力F作用3秒后消失，則第5秒末物體的速度和加速度分別是A．v=7.5m／s，a=l.5m／s2B．v=4.5m／s，a=l.5m／s2C．v=4.5m／s，a=0D．v=7.5m／s，a=0