要做到灵活、简捷地解答物理问题,能否巧妙地选取研究对象,或者恰当地选择参照系,是十分重要的。 一、巧选研究对象 在解答物理问题时,经常遇到两个或两个以上的物体所组成的比较复杂的相互作用的系统,要正确分析和解答这类问题的关键,首先就是如何确定研究对象,研究对象选得准,能迅速突破难于下手的困境;研 It is very important to be able to answer the physics questions flexibly and simply, whether to select research objects in a clever manner, or to properly select a reference system. 1. When selecting the research object to solve physical problems, it often encounters a complex interaction system composed of two or more objects. The key to correctly analyzing and answering such questions is how to determine the study. Subjects, who are selected accurately, can quickly overcome difficulties that are difficult to start;