如图所示,质量为M的木板,上表面水平,放在水平桌面上,木板上面有一质量为m的物块,物块与木板及木板与桌面间的动摩擦因数均为μ,若要以水平外力F将木板抽出,则力F的大小至少为( )
![](https://img.xkw.com/dksih/QBM/2016/10/11/1575937508270080/1575937508499456/STEM/41174de8-68a4-4f43-a80c-73e308b8d587.png?resizew=153)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1575937508270080/1575937508499456/STEM/41174de8-68a4-4f43-a80c-73e308b8d587.png?resizew=153)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2016-12-08 23:15:58
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【知识点】 受恒定外力的板块问题
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【推荐1】如图所示,木块A质量为1kg,木块B的质量为4kg,叠放在水平地面上,AB间的最大静摩擦力为1N,B与地面间的动摩擦因数为0.1,今用水平力F作用于B,则保持A、B相对静止的条件是F不超过(g=10m/s2)( )
![](https://img.xkw.com/dksih/QBM/2020/10/14/2570722897018880/2574332890218497/STEM/9d09b3bd-37c3-468d-ab78-d218f7e3632a.png?resizew=133)
![](https://img.xkw.com/dksih/QBM/2020/10/14/2570722897018880/2574332890218497/STEM/9d09b3bd-37c3-468d-ab78-d218f7e3632a.png?resizew=133)
A.1N | B.4N | C.10N | D.6N |
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【推荐2】如图所示,光滑的水平面上静置质量为
的平板小车,在小车左端加一个由零逐渐增大的水平推力F,一个大小不计、质量为
的小物块放在小车右端,小物块与小车间的动摩擦因数
,小车足够长.重力加速度g取
,设最大静摩擦力等于滑动摩擦力,下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/918a2715-4f50-4274-96d0-e3b24f778e47.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccf0ab33344a142a817b80711bb5c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dee915e2fb7b8a1f4328473f9c18ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced8cbb708a1c7b367d9a14c8eaa691b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63519b11c51441dd31d22aea2e0a4d2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/918a2715-4f50-4274-96d0-e3b24f778e47.png?resizew=149)
A.当F增加到![]() |
B.当F增加到![]() |
C.当![]() ![]() |
D.当![]() ![]() |
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