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14372017-2018学年八年级人教版物理下册(课件+习题):11.1功982.95KB982.95Brarczwlzx
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功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><W</em><sub>2</sub><em><W</em><sub>3</sub> B.<em>W</em><sub>1</sub><em><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><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>>F</em><sub>乙</sub> B.<em>F</em><sub>甲</sub><em><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
 
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><W</em><sub>2</sub><em><W</em><sub>3</sub> B.<em>W</em><sub>1</sub><em><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><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>>F</em><sub>乙</sub> B.<em>F</em><sub>甲</sub><em><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
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