论文部分内容阅读
1 可以讲点加速参照系的运动问题 关于相对运动,我们一直是讲到相对速度就止步,不讲相对加速度,好像一提到相对加速度和加速参照系的问题,就要提出非惯性系和惯性力等概念,使学生难以接受.以我的经验看,不引入非惯性系和惯性力,完全可以给学生讲点这方面的简单知识并应用它去解决一些问题。其实学生平时通过火车进出车站和轮船离靠码头等现象的观察,已获得了有关相对加速度和加速参照系的一些感性体会,此外在学习,了速度和力的合成后,在运算上接受加速度合成已没有什么困难。更重要的是,我以为让学生接触一点相对加速度和加速参照系方面的问题是物理思维方法教学的需要,有利于克服长期形成的地面参照系中的思维定势,开阔学生的思路。最后,作为一种解题方法,它把两体问题变为单体问题使有些问题解法格外简捷,介绍给学生也是很有价值的。
1 We can talk about the motion problem of the accelerated reference system. With respect to relative motion, we have always said that the relative velocity stops, we do not speak about relative acceleration, and if we mention the problem of relative acceleration and acceleration of the reference frame, we must come up with non-inertial frames and inertia. The concepts of force and so on make it difficult for students to accept. In my experience, without introducing non-inertial systems and inertial forces, students can be given a simple knowledge of this area and apply it to solve some problems. Actually, students usually get some sentimental experiences about relative acceleration and acceleration reference system through the observation of trains coming in and going out of the station and the ship leaving the dock. In addition, after learning, synthesis of speed and force, the acceleration synthesis is accepted in operation. There is no difficulty. More importantly, I think that letting students get in touch with a bit of relative acceleration and speeding up the reference system is a need for the teaching of physical thinking methods, which helps to overcome the long-established thinking in the ground reference system and broaden students’ thinking. Finally, as a problem-solving method, it turns the two-body problem into a single problem, which makes it easier to solve some problems. It is also valuable to introduce it to students.