[err:数据源标签'PE.DataSource id="cone" datasource="资料_内容页" itemId="97674" xslt="true" '返回数据错,原因:名称中不能包含“<”字符(十六进制值 0x3C)。 行 90,位置 10。,源码:976749 <meta http-equiv="refresh" content="0;url=/Item/97673.aspx" /> /Item/97673.aspx <meta http-equiv="refresh" content="0;url=/Item/97673.aspx" /> 14372017-2018学年八年级人教版物理下册(课件+习题):11.1功982.95KB982.95Brarczwlzx 轶名 czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?id=97674"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=dayhits&id=97674"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=weekhits&id=97674"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=monthhits&id=97674"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetBrowseTimes.aspx?id=97674"></script> <img src="/images/star5.jpg" /> 0 2018年03月02日/UploadFiles/Soft/2018/3/201803021613324091.jpg 第 1 节 功   一、知能演练提升 1 .下列实例中,有力对物体做功的是<p align="center" style="text-align:center;"> <strong>第</strong> <strong>1</strong> <strong>节</strong> <strong>功</strong></p> <p> </p> <p>一、知能演练提升</p> <p> <strong>1</strong> <em>.</em>下列实例中,有力对物体做功的是(  )</p> <p>A.跳水运动员从跳台跳下</p> <p>B.货物随水平传送带匀速移动</p> <p>C.举重运动员举起杠铃停在空中</p> <p>D.小球在光滑水平面上滚动</p> <p> <strong>2</strong> <em>.</em>一个人先后用同样大小的力<em>F</em>将不同质量的物体分别在光滑水平面、粗糙水平面和粗糙斜面上沿力的方向移动相同的距离<em>s</em>(如图所示),该力在这三个过程中所做的功分别为<em>W</em><sub>1</sub>、<em>W</em><sub>2</sub>、<em>W</em><sub>3</sub>。关于它们之间的大小关系说法正确的是(  )</p> <p align="center" style="text-align:center;"> <img alt=" " height="65" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" width="285" /> </p> <p>A.<em>W</em><sub>1</sub><em>&lt;W</em><sub>2</sub><em>&lt;W</em><sub>3</sub>           B.<em>W</em><sub>1</sub><em>&lt;W</em><sub>2</sub><em>=W</em><sub>3</sub></p> <p>C.<em>W</em><sub>1</sub><em>=W</em><sub>2</sub><em>=W</em><sub>3</sub>           D.<em>W</em><sub>1</sub><em>=W</em><sub>2</sub><em>&lt;W</em><sub>3</sub></p> <p> <strong>3</strong> <em>.</em>用大小不同的甲、乙两个力拉同一物体,两力所做的功<em>W</em>与在这两个力的方向上移动的距离<em>s</em>的关系图象如图所示,由图可知,甲、乙两个力的大小关系是(  )</p> <p align="center" style="text-align:center;"> <img alt=" " height="84" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.jpg" width="80" /> </p> <p>A.<em>F</em><sub>甲</sub><em>&gt;F</em><sub>乙</sub>                B.<em>F</em><sub>甲</sub><em>&lt;F</em><sub>乙</sub></p> <p>C.<em>F</em><sub>甲</sub><em>=F</em><sub>乙</sub>                D.条件不足,无法判断</p> <p> <strong>4</strong> <em>.</em>一位同学沿教学楼的楼梯从一楼匀速上到三楼,该同学上楼做的功最接近(  )</p> <p>A.30 000 J                B.3 000 J</p> <p>C.300 J                    D.30 J</p> <p> <strong>5</strong> <em>.</em> </p> <p align="center" style="text-align:center;"> <img alt=" " height="127" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image006.jpg" width="56" /> </p> <p>(2016·内蒙古赤峰中考)如图所示,人提着滑板在路上行走,手对滑板的力是        的,滑板只在        上移动,人提滑板的力没做功。 </p> 【内容简介】 第 1 节 功   一、知能演练提升 1 .下列实例中,有力对物体做功的是(  ) A.跳水运动员从跳台跳下 B.货物随水平传送带匀速移动 C.举重运动员举起杠铃停在空中 D.小球在光滑水平面上滚动 2 .一个人先后用同样大小的力F将不同质量的物体分别在光滑水平面、粗糙水平面和粗糙斜面上沿力的方向移动相同的距离s(如图所示),该力在这三个过程中所做的功分别为W1、W2、W3。关于它们之间的大小关系说法正确的是(  ) A.W1F乙                B.F甲 第 1 节 功 &#160; 一、知能演练提升 1 .下列实例中,有力对物体做功的是(  ) A.跳水运动员从跳台跳下 B.货物随水下载地址1|Soft/2018/3/201803021613432695.rar<p align="center" style="text-align:center;"> <strong>第</strong> <strong>1</strong> <strong>节</strong> <strong>功</strong></p> <p> </p> <p>一、知能演练提升</p> <p> <strong>1</strong> <em>.</em>下列实例中,有力对物体做功的是(  )</p> <p>A.跳水运动员从跳台跳下</p> <p>B.货物随水平传送带匀速移动</p> <p>C.举重运动员举起杠铃停在空中</p> <p>D.小球在光滑水平面上滚动</p> <p> <strong>2</strong> <em>.</em>一个人先后用同样大小的力<em>F</em>将不同质量的物体分别在光滑水平面、粗糙水平面和粗糙斜面上沿力的方向移动相同的距离<em>s</em>(如图所示),该力在这三个过程中所做的功分别为<em>W</em><sub>1</sub>、<em>W</em><sub>2</sub>、<em>W</em><sub>3</sub>。关于它们之间的大小关系说法正确的是(  )</p> <p align="center" style="text-align:center;"> <img alt=" " height="65" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" width="285" /> </p> <p>A.<em>W</em><sub>1</sub><em>&lt;W</em><sub>2</sub><em>&lt;W</em><sub>3</sub>           B.<em>W</em><sub>1</sub><em>&lt;W</em><sub>2</sub><em>=W</em><sub>3</sub></p> <p>C.<em>W</em><sub>1</sub><em>=W</em><sub>2</sub><em>=W</em><sub>3</sub>           D.<em>W</em><sub>1</sub><em>=W</em><sub>2</sub><em>&lt;W</em><sub>3</sub></p> <p> <strong>3</strong> <em>.</em>用大小不同的甲、乙两个力拉同一物体,两力所做的功<em>W</em>与在这两个力的方向上移动的距离<em>s</em>的关系图象如图所示,由图可知,甲、乙两个力的大小关系是(  )</p> <p align="center" style="text-align:center;"> <img alt=" " height="84" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.jpg" width="80" /> </p> <p>A.<em>F</em><sub>甲</sub><em>&gt;F</em><sub>乙</sub>                B.<em>F</em><sub>甲</sub><em>&lt;F</em><sub>乙</sub></p> <p>C.<em>F</em><sub>甲</sub><em>=F</em><sub>乙</sub>                D.条件不足,无法判断</p> <p> <strong>4</strong> <em>.</em>一位同学沿教学楼的楼梯从一楼匀速上到三楼,该同学上楼做的功最接近(  )</p> <p>A.30 000 J                B.3 000 J</p> <p>C.300 J                    D.30 J</p> <p> <strong>5</strong> <em>.</em> </p> <p align="center" style="text-align:center;"> <img alt=" " height="127" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image006.jpg" width="56" /> </p> <p>(2016·内蒙古赤峰中考)如图所示,人提着滑板在路上行走,手对滑板的力是        的,滑板只在        上移动,人提滑板的力没做功。 </p>人教版不限备课综合专供vip会员rar <img src="/UploadFiles/Soft/2018/3/201803021613324091.jpg" alt="2017-2018%e5%ad%a6%e5%b9%b4%e5%85%ab%e5%b9%b4%e7%ba%a7%e4%ba%ba%e6%95%99%e7%89%88%e7%89%a9%e7%90%86%e4%b8%8b%e5%86%8c%ef%bc%88%e8%af%be%e4%bb%b6%2b%e4%b9%a0%e9%a2%98%ef%bc%89%ef%bc%9a11.1%e5%8a%9f" border="0" /> /UploadFiles/Soft/2018/3/201803021613432695.rar <script type="text/javascript" src="/cuplayer4/js/swfobject.js"></script> <div class="video" id="CuPlayer"><b><img src="/cuplayer4/images/loading.gif" /> 网页视频播放器加载中,请稍后...<a href="http://www.cuplayer.com/cuplayer" target="_blank">点此升级>></a></b></div> <script type="text/javascript"> var so = new SWFObject("/cuplayer4/player.swf","myCuPlayer","940","465","9","#000000"); 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