问题 实验题

如图,是一次测量玩具小车运动的平均速度的实验:

(1)实验中需要的测量工具有停表和         

(2)实验测得的数据如下表,请你根据图中表针的位置,读出小车通过上半段路程所用的时间并填入表中(停表每格为0.2s),小车通过上半段路程的平均速度是        m/s。

路程运动时间平均速度
s1="30" cmt1 ="0.6" s0.5m/s
s2="15" cmt2 = 
(3)分析实验数据,你认为在从斜面上滑下的过程中,小车做         直线运动( 选填“匀速”或“变速”)。

 

答案

(1)刻度尺 (2)0.4s   0.375 (3)变速  

题目分析:根据速度公式回答,所用的测量根据分别是刻度尺、秒表;先后利用速度公式求出小车在前半段路程的平均速度,再用总路程除以总时间得出小车在全程的平均速度;(1)小车运动的路程用刻度尺测量,运动的时间用秒表测量,实验的原理是;(2)由图可知,停表走了2个格,每个格是0.2s,所以是0.4s;小车通过上半段路程的平均速度是;(3)由(2)的计算结果知道,小车在前半程的平均速度为0.375m/s,小车在后半程的平均速度为0.5m/s,可见小车做的是变速运动,不是匀速直线运动.

点评:本题关键(易错点):计算平均速度时,用总路程除以总时间,切记,平均速度不是速度的平均(加起来除以2).

名词解释
写作题

第二节 读写任务(共l小题,满分25分)

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

Friendship with oneself is all important, because without it one cannot be friends with anyone else in the world.

We often focus on building relationships with others that we forget the essential first step: being friends of ourselves. That is the crucial first step if we are to have good relationships with others. How can we have good relationships with others if we don’t even have good relationship with ourselves?

Here are some tips:

1. Forgive yourself

You may have made those mistakes in the past, but is there anything you can do about them? I don’t think so, except learning from them. It’s true that you are not perfect, but neither is everybody else. It’s normal to make mistakes, so do yourself a favor by giving yourself forgiveness.

2. Focus on your strengths

Instead of focusing on your weaknesses, focus on your strengths. You always have some strengths which give you a unique combination nobody else have. Recognize your strengths and build your life around them.

3. Stop comparing yourself with others

You are unique. You can never be like other people, and neither can other people be like you. The way you measure your success is not determined by other people and what they achieve. Instead, it is determined by your own life purpose. You have everything you need to achieve your life purpose, so it’s useless to compare yourself with others.

[写作内容]

假设你的同学总觉得自己学习不如别人,因而产生自卑心理,请你写根据上面所提供的材料写一篇短文,用E-mail 发给他(她):

1.以约30个词概括文章大意,说明首先要对善待自己的观点;

2.以约120个词表达你对他(她)的建议和希望,并包括如下要点:

(1) 分析他(她) 产生自卑心理的原因;

(2) 找出他(她)的优势;

(3) 提出合理建议。

[写作要求]            1.作文中可使用自己的亲身经历或虚构的故事,也可以参照阅读材料的内容但不得直接引用原文中的句子;       2.文中不能出现真实姓名和学校名称;  3.文章开头和结尾已写好。

[评分标准]

概括准确,语言规范,内容合适,篇章连贯。

Dear Li Ping,

I’m glad that you trust me so much and tell me your true feeling, now I’ve read an article which says that                                                 

_____________________________________________________________________With the best wishes!

Yours truly,

Wang Yan