在我们高中物理第一册第二章《运动快慢的描述速度》中讲到速度计是来测定运动物体的瞬时速度,有学生问到速度计是如何来测定瞬时速度的?它的工作原理是什么?其实,一般的速度计的工作原理完全是物理知识的应用,而且速度计是取材于现实生活和生产中一个很好的实例,以此可以变形出很多有关物理知识的题材来,也可以以此搞研究性学习,下面先介绍一下速度计的工作原理。速度计一般是由机动车的前轮带动的,经变速 In the second chapter of our High School Physics Booklet I, “Description of the speed of movement,” I mentioned that a speedometer is used to measure the instantaneous speed of a moving object. Some students ask how the speedometer measures instantaneous speed. Its working principle is: What? In fact, the general working principle of the speedometer is entirely the application of physical knowledge, and the speedometer is a good example drawn from real life and production. In this way, many topics related to physical knowledge can be deformed. In order to engage in research learning, here’s how the speedometer works. The speedometer is usually driven by the front wheel of a motor vehicle