“长度的测量”是初中物理的入门课程.但在课堂上,对测量的本质是什么,长度的单位以及换算关系,长度单位的大小,测量值的构成,测量时读数的要求,零估读等知识,通常都是教师以讲述的方式传递给学生的.为了不使初中学生对这些知识感到枯燥乏味,并产生足够的学习热情,我们可以根据学生的特点,设计有针对性的活动,让学生在活动和解决具体问题中建构相关的知识,掌握相关的技能.1关于测量的本质许多教师在教学长度知识时,首先提出,所谓 “Measurement of Length” is an introductory course in physics at junior high school, but in the classroom, what is the nature of the measurement, the unit of length and the conversion, the size of the length unit, the composition of the measured value, the reading requirement at the time of measurement, zero Estimation and other knowledge, usually teachers are taught to tell the way to students in order not to make junior high school students feel boring of these knowledge, and generate enough enthusiasm for learning, we can design according to the characteristics of students, targeted activities , So that students in the activities and to solve specific problems in the construction of relevant knowledge, master the relevant skills.1 On the nature of measurement Many teachers in the teaching of length knowledge, first proposed that the so-called