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在物体的受力分析中,认识弹力和静摩擦力的概念、产生条件和掌握它们的大小、方向是高中物理的难点,为了突破这个难点,使学生对于这些力的概念的认识深化,我们在教学中提出了被动力的概念,并分层次地、有步骤地使学生掌握分析这些力的一般方法。 1 弹力和摩擦力的被动性弹力是由于物体在发生弹性形变时产生的力,在高中物理中,通常把弹力分为两类,一类是有明显的弹性形变的弹力,它的大小与弹性形变成正比,如弹簧的弹力,由胡克定律给出,弹簧的弹力的
In the force analysis of an object, recognizing the concept of the elastic force and the static friction force, generating conditions and grasping their size and direction is a difficult point in high school physics. In order to break through this difficulty, students’ understanding of the concept of these forces is deepened, and we are teaching. The concept of being motivated is proposed in the book, and students are given the general method of analyzing these forces hierarchically and step by step. 1 Passive elastic force of elastic force and friction force is due to the force generated when the object is elastically deformed. In high school physics, the elastic force is usually divided into two types. One is elastic force with obvious elastic deformation, and its size and elasticity. The form becomes proportional, such as the elasticity of the spring, given by Hooke’s law, the elasticity of the spring