论文部分内容阅读
一、 考点解读
考点1压强
压强是反映压力作用效果的物理量,压力的作用效果不仅和压力的大小有关,而且和受力面积的大小有关.在物理学中,把物体单位面积上受到的压力叫做压强,其定义式为p=F/S.国际单位制中F的单位是N,面积S的单位是m2,压强p的单位是帕斯卡(Pa),1Pa=1N/m2.
所谓物体的受力面积是指受压物体表面受压力作用的那部分面积,即受压物体与施压物体相互挤压的那部分面积,而不是受压物体的总面积。
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-1-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-2-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-3-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-4-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-5-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-6-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-7-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-8-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-9-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-10-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-11-l.jpg)
考点1压强
压强是反映压力作用效果的物理量,压力的作用效果不仅和压力的大小有关,而且和受力面积的大小有关.在物理学中,把物体单位面积上受到的压力叫做压强,其定义式为p=F/S.国际单位制中F的单位是N,面积S的单位是m2,压强p的单位是帕斯卡(Pa),1Pa=1N/m2.
所谓物体的受力面积是指受压物体表面受压力作用的那部分面积,即受压物体与施压物体相互挤压的那部分面积,而不是受压物体的总面积。
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-1-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-2-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-3-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-4-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-5-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-6-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-7-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-8-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-9-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-10-l.jpg)
![](https://www.soolun.com/img/pic.php?url=http://img.resource.qikan.cn/qkimages/czsw/czsw200603/czsw20060305-11-l.jpg)