杆秤实际上是利用在平行力的作用下,有固定转动轴物体的平衡原理制成的一种测定物体质量的工具,制作简单、使用方便。是我国人民日常生活中常用的量具之一。在初中物理的教学中占有很重要的地位。杆秤的粗细是不均匀的,秤钩一端较粗,向杆尾方向逐渐变细,刻度均匀等为杆秤的特征。但是,在教学中时常有学生提出:秤杆能否做成粗细均匀而称量的刻度又是等距离的呢?许多教师没有料到学生会提出这个问题而被问懵了,不知如何回答是好。现就这个问题讨论如下: 图1是粗细均匀杆秤的示意图。O点控提钮,A点拴秤钩,悬挂秤砣的 B点是可以移动的, 由于整个秤杆是粗细均匀的,故除秤砣外的整个秤杆的重心位置C与秤钩位置A分居提钮的两侧。由于秤砣和秤杆 Actually, a steelyard is a tool for measuring the quality of an object by using the principle of balancing the force of a parallel shaft under the action of a parallel force. It is simple to make and easy to use. It is one of the commonly used measuring tools in the daily life of our people. It plays an important role in the teaching of junior high school physics. The thickness of the steelyard is not uniform, and one end of the scale hook is thicker, gradually tapering toward the end of the rod, and the scale is uniform, which is a characteristic of the steelyard. However, there are often students in the teaching that whether the scales can be made uniform and the scales are equally equidistant. Many teachers did not expect students to ask this question and be asked, and I do not know how to answer it. This issue is now discussed as follows: Figure 1 is a schematic view of a uniform and uniform steelyard. O point control button, point A scale weight hook, B point of the hanging scale 是 can be moved, because the entire scale is thick and uniform, so in addition to the scale 砣 the center of gravity of the entire balance bar C and the balance hook position A separate mention button Both sides. Because of the scale and the lever