题目内容
如图所示,物体A、B用细绳与弹簧连接后跨过滑轮.A静止在倾角为45°的粗糙斜面上,B悬挂着.已知质量mA=3mB,不计滑轮摩擦,现将斜面倾角由45°减小到30°,那么下列说法中不正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006127604844.jpg)
A、弹簧的弹力将减小
B、物体A对斜面的压力将减少
C、物体A受到的静摩擦力将减小
D、弹簧的弹力及A受到的静摩擦力都不变
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006127604844.jpg)
A、弹簧的弹力将减小
B、物体A对斜面的压力将减少
C、物体A受到的静摩擦力将减小
D、弹簧的弹力及A受到的静摩擦力都不变
ABD
试题分析:当倾角为450时,以A为研究对象分析受力有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612776933.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612776897.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612791902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612807950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612838949.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000612854693.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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