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第一章机械运动

1.1 长度和时间的测量

一、长度的测量：

1、长度的单位：千米、米、、、、、纳米

符号：、、、、、、

2、单位的换算：1km=103m 1m= dm= cm= mm 1mm= μm

1μm= nm 1m= nm 1cm= m 1nm= m

560mm= m 165cm= m 1250km= m

3、长度的测量方法步骤

A、使用前，；

B、读数时视线；

C、记录结果时要写出和。

D、对刻度尺的使用，测量值需。

测量结果=数字（准确值+估读值）+单位

4、测量工具：钢直尺、钢卷尺、皮卷尺、直尺、折尺等

二、时间的测量

1、测量工具：古代有日晷（guǐ）、沙漏，现代有钟表、秒表等。

2、国际单位：秒（s）其他单位：、、

1h= min= s

15min21s= s 1h18min= min

3、秒表的使用方法

（1）、一般的秒表（停表）有两根针，长针是秒针，

每转一圈是30S；短针是分针，每转一圈是15 min。

（2）图中所示的最小分度是0.1s，即它的精度是0.1S。

（3）、读数：所测时间超过半分钟时，半分钟的整数

部分由分针读出，不足半分钟的部分由秒表读出，总

时间为两针之数之和。

（4）、秒表是测量时间间隔的常用仪表，表盘上有一

长的秒针和一短的分针，秒针转一周，分针转一格。

秒表的分度值常用的有0.2s和0.1s两种。秒表上端

的按钮是用来选紧发条和控制表针转动的。使用秒表时，用手握紧秒表，大拇指按在按钮上，按秒表分三步：

第一次按下时，表针开始转动，第二次按下时表针停止转动，第三次按下表针就回到零点。

三、误差 1. 误差：测量值与真实值之间总会有差别，这种差别就是误差。

错误：由于不遵守测量仪器的使用规则，或读取、记录测量结果时粗心等原因造成的。2、减小误差的方法：a. 选用更准确的测量工具 b.多次测量求平均值 c.改进试验方法

1

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阅读原文题目：An interview with Jackie Chan 高中英语阅读课公开课原文

persons’ pictures mentioned) Ss: he/she is .... T:What qualities of your idol attract you most (I will pick up three students to answer this question) T: do you want to know who my idol is Ss:no T:have a guess .(then I will show them a picture of Jackie Chan’s profile ) 》 Ss: he is Jackie chan. T: Ok, today, I will introduce my idol—Jackie Chan to all of you. First let us enjoy a video about Jackie Chan’s life. Then I will play a video about Jackie chan. 《 $ Step 2. Pre-reading (8 min)Task1. A small quiz (individual work,3 min) T: let’s check the following sentence using true or false .and I will pick up some students to say his or her answer and tell me why it is wrong or correct. # Ss:ok. 1. Get Ss to know something about Jackie Chan. 】 2. Serve as a warm-up for the following tasks.

人教版八年级英语上册导学案全册

【课题】 Unit1 How often do you exercise? Section A 1a-1c （1）（1课时） 【学习目标】 1.识记周末活动的词汇和6个频度副词（always, usually, often , sometimes , hardly ever ,never ）。 2.运用周末活动的词汇、频度副词及一般现在时简单谈论周末活动情况。 【重点，难点】 1.对6个频度副词细微差异的理解及使用。 2.弄清一般现在时在不同人称下动词形式及提问的变化。 【导学指导】 知识链接： 问：什么情况下使用一般现在时？ 答：简单讲，当动作经常、反复发生，表达习惯、爱好、客观规律和现在的状态 时需使用一般现在时。 问：一般现在时的基本结构是什么？ 动词原形（当主语不是第三人称单数） 答：主语+ 动词的第三人称单数形式（当主语是第三人称单数时） 问：什么是动词的第三人称单数？什么又是主语的第三人称单数？ 物。 自主互助学习 一、自学： 1.仔细观察课本第一页图片，根据所给例子填写下列空格。 例:Picture a (图a ): shop What is the girl in Picture a doing? She is shopping. Picture b :_______ a book What is the girl in Picture b doing? ______________________________ Picture c :________ ________________________________? ________________________________. Picture d :________ ______ ________________________________? ________________________________. Picture e :________ _______ _______________________________? ________________________________. 2.根据汉语提示，完成下列其他weekend activity (周末活动)短语 。 去购物_______________; 去钓鱼_______________; 去徒步旅行_______________;去看电影______________;去踩滑板_______________;去滑冰________________;去游泳__________________; 打篮球__________________; 弹钢琴______________;看望外祖父母__________________；为考试学习______________; 帮父母做家务__________。 二、展示交流

八年级上册英语学案答案

八年级上册英语学案答案

八年级英语秋季学案参考答案 Unit 1 Period one 学点训练 1. How often 2. How long 3. How soon 达标检测 一 1.once 2. watches 3.activities 4. is 5. surfing 二 1. surfing the Internet 2.favorite program 3. How often 4.twice a week 5 hardly ever 三What do you usually do on Sunday? What sport do you play? Yes, I do How often do you play soccer? How long do you play soccer every day? Period two 学点训练 1 Most 2 Some 3 No 4 All 达标检测 一BBBBBB ABBCC 二ABBAB

Period three 学点训练 1. am good at 2. is good for 3. Are good with 4. is good to 达标检测 一CACCA 二（1）它（垃圾食品）对他们的健康有害。 （2）他们知道这不是个好习惯，但是他们还是吃。 （3）他们中有些人每周吃一两次。 （4）他几乎从不锻炼。 （5）也许我不是那么健康，但是我会觉得很开心。 Period four 学点训练 1.may be 2. Maybe 达标检测 一 1.eating ,2.to speak,3. differences,4. help better,5. Reading 二BBCCA 三BABBA