物体在无限光滑的平面上运动就不受摩擦力,这已被人们所公认,我做了一个实验,由实验结果推知,事实并非如此。实验的过程是这样的:用一弹簧秤拉着一钢块在钢板上运动,起初,钢块和钢板的接触面都比较粗糙,这时弹簧称示数较大,不断的换用不同的钢块和钢板,使它们的接触面越来 It is well-known that an object moves in an infinitely smooth plane without friction. I have done an experiment and inferred from the experimental results that this is not the case. The experimental process is as follows: a spring balance is used to pull a steel block to move on the steel plate. Initially, the contact surface between the steel block and the steel plate is relatively rough. At this time, the number of springs is larger, and different steel blocks are constantly used. And steel plates, making their contact surfaces more and more