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中师《物理》第一册第67页中，介绍了“物体做曲线运动条件”的演示实验。这个演示实验容易做成功，但效果不很理想。因为在水平桌面上演示，学生不能清楚地看到钢珠运动轨迹的变化；有时钢珠落地，还分散学生注意力，给教师操作也带来一些麻烦。我在教学中，把这个演示实验改?
The 67th page of the first volume of the book “Physics” in the division of the Central Normal University introduced the demonstration experiment of “objects doing curve motion conditions”. This demonstration experiment is easy to succeed, but the effect is not ideal. Because of the demonstration on the horizontal desktop, students cannot clearly see the changes in the ball’s trajectory; sometimes steel balls drop to the ground, distract the students, and cause trouble for the teachers. In teaching, I changed this demonstration experiment?