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下图所示的四幅图是小新提包回家的情景,小新提包的力不做功的是( ) A. 将包提...
下图所示的四幅图是小新提包回家的情景,小新提包的力不做功的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103013_ST/images0.png)
将包提起来
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103013_ST/images1.png)
站在水平匀速
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103013_ST/images2.png)
乘升降电梯
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103013_ST/images3.png)
提着包上楼
考点分析:
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同一物体沿相同水平地面被匀速移动,如图所示,拉力分别为F
甲、F
乙、F
丙,不记滑轮与轻绳间的摩擦,比较它们的大小,则( )
A.F
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丙D.F
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103011_ST/images0.png)
B.
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D.
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如图所示,通过定滑轮沿三个不同方向拉同一重物G,所用的拉力分别为F
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3,则这三个力的大小关系是( )
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A.F
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3D.无法判断
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A.
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B.
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D.
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![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131028161017673110372/SYS201310281610176731103008_ST/images0.png)
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核桃夹
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起子
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