在学习摩擦力时,一般采用图1所示的演示装置进行演示实验。可是在实际操作过程中,发现这个演示实验装置的演示效果不够理想。尤其是在演示滑动摩擦力时,它要求滑块做匀速运动。由于滑动摩擦力小于最大静摩擦力,所以控制滑块做匀速运动比较困难。滑块是否在做匀速运动,也只能凭直觉判断,随意 When learning friction, the demo device shown in FIG. 1 is generally used for demonstration experiments. However, during the actual operation, we found that the demonstration of this demonstration device was not satisfactory. In particular when it comes to sliding friction, it requires the slider to move at a constant speed. As the sliding friction is less than the maximum static friction, it is more difficult to control the slider to do uniform motion. Is the slider doing uniform motion, it can only be judged by intuition, at random