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临界状态是指某种物理现象变化为另一种物理现象或物体从某种特性变化为另一种特性时,发生质的飞跃的转折状态。临界问题是高考的热点,试题中经常考查到临界状态。解决临界问题的关键是:找临界条件时要特别关注题目中常用“恰好”、“最大”、“至少”、“不相撞”、“不脱离”……等词语对临界状态给出了明确的暗示。通过过程及状态分析,找出临界状态下满足的条件或规律,把握条件,结合相应的物理规律,运用数学知识求解。
Critical state refers to a transitional state in which a certain physical phenomenon changes to another physical phenomenon or an object undergoes a qualitative leap from one property to another. The critical issue is the hot spot of the college entrance examination. The critical status is often examined in the test questions. The key to solving the critical problem is: when you are looking for critical conditions, you should pay special attention to the “commonly”, “maximum”, “at least”, “not collided”, and “does not disengage from” the topics... Words such as ... give clear indications of the critical state. Through the analysis of process and state, we can find the conditions or laws satisfied under the critical state, grasp the conditions, combine the corresponding physical laws, and use mathematical knowledge to solve.