while one end of the board is being raised,what is the effec

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/04/30 09:20:29

while one end of the board is being raised,what is the effect on the force of friction between the board and the object?
答案给的是steadily increases为啥呢?
回复一楼的：没有图,它属于前几题的
不好意思补充下：前面题设还说是转到50°就停了.也就是说,三楼的细致地讲下为什么增大就好了

如果物体不动的话那么：
静摩擦力f、重力G、支持力N回力应该为0
很容易得到f=Gsina,a为倾斜角
sina在0度

What is the end of one hundred? 英语翻译the report is fastened to one end of a pole while the bo What is the end of the What is the end of the world? what is the end of every thing? what is the end of everything What is the end of everything? What is the begining of electricity,the end of time? what is the beginning of electricity,the end of time? the price is raised? What is the meaning of love in the end ? What is the feeling of love in the end?