题目某同学研究在固定斜面上运动物体的平均速度、瞬时速度和加速度之间的关系。使用的器材有:斜面、滑块、长度不同的矩形挡光片、光电计时器。实验步骤如下:①如图1,将光电门固定在斜面下端附近,将一挡光片安装在滑块上,记下挡光片前端相对于斜面的位置,令滑块从斜面上方由静止开始下滑。 Problem Some student studied the relationship between the average speed, the instantaneous speed and the acceleration of a moving object on a fixed incline. Equipment used are: bevel, slider, rectangular length of the block, photoelectric timer. The experimental steps are as follows: ① as shown in Figure 1, the photoelectric door is fixed near the lower end of the bevel, a light block mounted on the slider, note the front end of the light block relative to the bevel position, so that the slider from above the bevel start Falling.