第三章 声
本章概述与课程标准要求
本章内容属于课程标准中科学内容的第二个主题“运动和相互作用”中的一个二级主题。内容标准要求如下：
(1) 通过实验探究，初步认识声产生和传播的条件。
(2) 了解乐音的特性。
(3) 了解现代技术中与声有关的应用。
(4) 知道防止噪声的途径。
声是初中物理学习中学生最初接触到的物理现象。本章让学生通过对丰富多彩的声现象的学习，了解声音是由物体振动发生的；声的传播需要介质；声波是波的一种，频率越高，音调越高；振幅越大响度越大等等这些内容，对声波的初步了解，有助于学生以后对光波、电磁波的学习；教学中须使学生认识到音乐的美妙，让声为人类服务，又要知道噪声的危害以及防止噪声的途径，初步养成关于防止声污染的环保意识。
这一章主要由学生熟悉的生活情景进入到物理知识的探究中。教材在这部分内容中安排了两个实验探究，并在发展空间的家庭实验室中也设计了探究声的反射和共鸣的活动，让学生经历多个物理探究的过程，通过观察物理现象，培养多种能力，初步认识科学研究方法的重要性。
示波器、话筒：话筒可以将声信号转换为电信号。示波器可以将电信号以图形的形式显示出来。一般将被测电信号从Y输入端输入。
本章常用仪器
音叉：是用来演示声音的发生和传播的仪器。使用时，要用音叉槌敲击音叉。
本章课时安排建议
本章共五节，建议用5课时完成，具体课时安排如下：
第1节 什么是声 1课时
第1节 乐音的特性 1课时
第1节 奇异的声现象 1课时
第1节 噪声 0.5课时
第1节 声与现代技术 0.5课时
复习课 1课时
（教案和教学设计）课件[八年级物理上]第三章 声教育资源
教学资料人教新目标八下教案Unit 4 He said I was hard-workin
Unit 4 He said I was hard-working .
Teaching goals:
1. Vocabulary: hard-working ,report card ,can do better ,speaking ,listening ,average ,surprise .
2. Patterns: What did your math teacher say ?
He said he could speak three languages .
3. 直接引语和间接引语的转换。
4. 写成绩报告单，并能将自己的成绩报告给他人。
Important and difficult points :
1. 新的词汇和习语。
2. 个人Report card 的写作。
3. 直接引语转换间接引语中，注意一些关键动词的变化和人称代词的变化。
Teaching aids : teaching cards , pictures and a tape recorder .
Period 1
Teaching contents:SectionA 1a,1b,1c,2a,2b,2c,Grammar focus .
Teaching procedures :
Step 1 Leading in
Ask several Ss what they are going to do after school .Write their sentences on the Bb .
Step 2 Pre-task
Say, These Ss talk about what they are going to do after school ,if you want to tell a friend what they said ,how would you tell him ?
Write the words “He said” and “She said” on the Bb .Say,We can use the words “He said” and “She said” to tell your friend like this :He/She said he/she was going to play basketball after school .Get the Ss to repeat .
Repeat this process with the other sentences on the Bb .
Step 3 While-task
SB Page 26 , 1a .
1. Ask a student to read the four questions .
2. point out the TV screens in the picture .Ask one student to read what the person says in the first picture .Then ask another student :What did she/he say ? Help to answer :She/He said she/he was having a surprise party for Lana on Friday night .
3. Repeat with the other pictures .
SB Page 26 , 1c .Pairwork.First Ss work in pairs ,then ask some pairs to present their dialogues to the class .
SB Page 26 , 1b .Play the recording and correct the answers .
Step 4 Post-task
SB Page 27 , 2a & 2b .
1. Ask several Ss to read these sentences .
2. Play the recording .Ss circle their answer .
3. Check the answers .
Step 5 Grammar Focus
1. Review the grammar box by ask Ss to say the statements .
2. Explain: In each case ,the direct speech talks about present situations and the reported speech talks about past situations .
Step 6 Homework
用she/he said 将直接引语改为间接引语。
1. I am a clever girl . 2. I am having lunch at school .
3. I can dance well . 4. I play football every day .
5. I don’t like my younger brother .
教学后记:
Period 2
Teaching contents :SectionA 3a ,3b ,4 ,SectionB 2a ,2b ,2c .
Teaching procedures :
Step 1 Leading in
Check the homework .Ask several students to read their sentences to the class .
Step 2 Pre-task
SB Page 28 , 3a .
1. Read the article to the class .
2. Ask Ss to fill in the blanks on their own .
3. Correct the answers .
SB Page 28 , Part 4 .Ss work in groups of four to complete the role plays .Ask a few Ss to show their role plays to the class .
Step 3 While-task
SB Page 29 , 1a .
1. Read the sentences to the class and teach new words .Then ask Ss to check the sentences that are true for themselves .
2. Ask one student to read each sentence to the class and ask Ss to raise their hands if they checked that answer .
[1] [2] [3] [4] [5] [6] [7] [8] [9] 下一页
