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１制作动机高中物理教材《曲线运动》一节为了说明“当运动物体所受合外力的方向跟它的速度方向不在同一直线时，物体就做曲线运动。”无论新老教材所举实验都是让钢珠在水平面上进行（图１）。按图１做该实验，钢珠的速度和磁铁的位置两者需要配合适当才能获得明显的曲线运动
1 The motivational high school physics textbook “Curve Movement” section explains that “when the direction of the external force applied to a moving object is not in the same line as its speed, the object will do curved motion.” Let the steel ball be in the horizontal plane (Figure 1). According to Figure 1, this experiment requires that both the speed of the steel ball and the position of the magnet need to be properly matched to obtain a significant curve motion.