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初二年级《自然科学》中虽只讲力的一些最简单的知识,但却包含了“运动学、动力学、静力学”中最基础的知识和力学中的“万有引力、弹性力和摩擦力”中一些最常见的力,这对抽象思维刚开始占主导地位的初二年级学生的学习造成困难,故学生普遍反映“学物理难”。教师在教学中会碰到较多的难点,如:参照物的选择、力的初步概念、惯性、静摩擦、托里拆利实验的原理、功的概念……等。作为教师应根据学生心理特点,运用针对某一教学难点突破的有效教学
The first two grades of “natural sciences” although stresses only some of the most simple knowledge, but it contains “kinematics, dynamics, statics,” the most basic knowledge and mechanics of "universal gravitation, elasticity and friction Some of the most common forces, which have caused difficulties for the first year sophomore students whose abstraction thought has just begun to dominate, are generally reflected in the students' learning physics. Teachers in teaching will encounter more difficulties, such as: the choice of reference objects, the initial concept of force, inertia, static friction, Torrey-Presley experiment principle, the concept of work ... and so on. As a teacher should be based on the psychological characteristics of students, the use of a teaching difficult breakthroughs in effective teaching