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约束系统中的物体,由于相互制约,速度间存在着确定的数量关系。而建立这种关系,恰是我们教学的难点,通常根据运动情况来确定分运动,从而进行速度分解,教学效果往往不甚理想。本刊1993年第3期周久璘同志介绍了一种很好的研究方法。现笔者根据教学的实践,介绍另一种研究途径。 1 约束系统特征分析我们研究的约束体,是指物体间受到轻质硬杆或刚性细绳的约束,以及物体间通过一定的接触而约束。不论是哪种情况,组成约束系统的两个(或两个以上)物体间存在相互的约束力——作用力与反作用力。由
Objects in the restraint system have certain quantitative relationships between speeds due to mutual restraint. The establishment of such a relationship is precisely the difficulty of our teaching. Usually, the sub-sports are determined according to the movement conditions, so that the speed is decomposed and the teaching effect is often not ideal. Comrade Zhou Jiuzhen introduced a very good research method in the 3rd issue of the Journal in 1993. According to the teaching practice, the author introduces another research approach. 1 Analysis of Constrained System Features The constraints we study are the constraints of objects that are bound by lightweight hard rods or rigid strings, and the constraints imposed by certain contacts between objects. In either case, there are mutual binding forces between the two (or more than two) objects that make up the restraint system—action force and reaction force. by