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在高中物理中,静摩擦力是学生学习的重点和难点内容。“静摩擦力的方向总是跟接触面相切,并且跟相对运动趋势方向相反。”因此,静摩擦力的产生需要物体有相对运动趋势这一重要条件。“相对运动趋势”的概念非常抽象,教师指导学生理解该概念的教学过程是一大难点。笔者借制作“静摩擦相对运动趋势演示仪”改变物体运动状态形象地演示“相对运动趋势”这一概念。实验演示装置如图1。
In high school physics, static friction is the focus of students’ learning and difficult content. “The direction of static friction is always tangent to the contact surface and opposite to the direction of relative motion.” “Therefore, the generation of static friction requires an important condition that the object has relative motion tendency. The concept of ”relative movement trend“ is very abstract. It is a difficult point for teachers to instruct students to understand the teaching of this concept. The author by making ”static friction relative movement trend demonstrator “ to change the status of the movement of the object to demonstrate ”relative movement trend " concept. Experimental demonstration device shown in Figure 1.