这天新课结束后,我随即板书一道题目,让学生当堂解答,没想到全班唯有李同学做错了。我很诧异,这孩子向来物理成绩优秀,今天怎么啦?这道题目是:请判断下列因素中,与滑动摩擦力大小有关的是(%%):A、接触面的粗糙程度;B、压力的大小;C、相对运动速度的大小;D、接触面积的大小。本题的 After the new class ended that day, I immediately put a question on the blackboard and asked the students to answer the questions when they did not expect that only the classmate Li was wrong. I am very surprised, this child has always been excellent physical results, how is it today? This question is: Please determine the following factors, the size of the sliding friction is (%%): A, the roughness of the contact surface; B, pressure Of the size; C, the relative speed of the size of the movement; D, the size of the contact area. This question