高中《物理》“显示单摆的振动图象”实验是这样介绍的 :把漏斗吊在架上 ,下方放一块硬纸板 ,纸板上面一条直线OO’ ,漏斗静止不动时正好在直线的上方。在漏斗里装满细砂 ,让漏斗摆动 ,同时沿着跟摆动方向垂直的方向匀速拉动纸板 ,因为每一时刻都从漏斗中漏出细砂 ,所以落在硬 The experiment of high school “Physics” “Showing Oscillating Image of Single Pendulum” is described as follows: hang the funnel on the shelf and put a piece of cardboard below it. A straight line OO’ above the cardboard is just above the straight line when the funnel is stationary. Fill the funnel with fine sand, and let the funnel swing while pulling the cardboard at a constant speed in the direction perpendicular to the direction of the swing, because at every moment it leaks fine sand from the funnel, so it falls hard.