题目内容
如图所示,水平转盘可绕竖直中心轴转动,盘上叠放着质量均为1kg的
、
两个物块,
物块用长为0.25m的细线与固定在转盘中心处的力传感器相连,两个物块和传感器的大小均可不计.细线能承受的最大拉力为8N.
、
间的动摩擦因数为0.4,
与转盘间的动摩擦因数为0.1,且可认为最大静摩擦力等于滑动摩擦力.转盘静止时,细线刚好伸直,传感器的读数为零.当转盘以不同的角速度匀速转动时,传感器上就会显示相应的读数
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415510229069707.png)
求:(1)绳子刚有拉力时转盘的角速度;
(2)A物块刚脱离B物块时转盘的角速度;
(3)绳子刚断开时转盘的角速度;
(4)试通过计算在坐标系中作出
图象(作在答题卡上).
取10m/s2.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101978302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415510229069707.png)
求:(1)绳子刚有拉力时转盘的角速度;
(2)A物块刚脱离B物块时转盘的角速度;
(3)绳子刚断开时转盘的角速度;
(4)试通过计算在坐标系中作出
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155102352476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155102414273.png)
(1)2rad/s(2)4rad/s(3)6rad/s(4)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551025553052.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551025553052.png)
试题分析:当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551027261312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155102789377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155102898566.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155103382735.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551036621353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551037401106.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155103865578.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551039741712.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155101088309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155100932300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155104458372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551046921914.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155104910369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551049881258.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551051131054.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155105316572.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241551025553052.png)
点评:难度较大,物体A做匀速圆周运动的向心力由静摩擦力提供,随着角速度的逐渐增大,静摩擦力也逐渐增大,当静摩擦力增大到最大静摩擦力时两者发生相对滑动
![](http://thumb2018.1010pic.com/images/loading.gif)
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