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追及与避碰问题是运动学中较为综合且有实践意义的一类习题,它往往涉及两个以上物体的运动过程。然而每个物体的运动规律又不尽相同,不同的运动形式又能组合出多种不同的追及类型,因此学生面临这类题型时往往分析不清物理情形而无从下手。追及问题的主要条件:两物体在追及时刻处在同一位置。模式:A 追 B,A 与 B 之间的初始距离 s_O(s_O根据条件可以为零),则 A 追上 B 时必有关系式 s_A=s_B+s_O.对于匀速(或匀加速)物体追及减速物体这种类型,肯定能追得上,追上时也一定有位移关系 s_A=s_B+s_O,但是将这个方程进
The problem of tracking and avoiding collision is a kind of exercises that are more comprehensive and practical in kinematics. It often involves the movement process of more than two objects. However, the motion law of each object is not the same, and different forms of movement can be combined with a variety of different types of catch-up. Therefore, when students are faced with such questions, they often cannot analyze the physical situation and cannot start from scratch. The main condition for catching up with the problem is that the two objects are in the same position at the moment of recovery. Mode: A chasing B, the initial distance s_O between A and B (s_O may be zero according to conditions), then A must catch up with B when there is a relation s_A = s_B + s_O. For uniform speed (or uniform acceleration) object tracking and deceleration Obviously, this type of object can catch up, and there must be a displacement relationship s_A=s_B+s_O when catching up, but this equation will be