演示实验应突出课堂教学的直观效果。高中物理新教材用水平弹簧振子替代以前的砂摆来演示简谐运动的图像,但在教学中发现,它仍存在一些不足:一是描绘图线的笔和振子会受到纸和金属杆较大摩擦,不便描绘图像;二是课堂演示时绝大多数学生既不能直接观察到图像的形成过程,又不易直? Demonstration experiments should highlight the intuitive effects of classroom teaching. The new high school physics textbook uses a horizontal spring oscillator to replace the previous sand pendulum to demonstrate the harmonic motion image. However, in the teaching, it found that it still has some deficiencies: First, the pens and transducers that depict the lines are subject to larger paper and metal rods. Friction, inconvenient to describe the image; Second, the vast majority of students in the classroom demonstration can not directly observe the image formation process, but also difficult to straight?