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1990年高考物理试题中有关物体平衡的问题的比例明显高于以往历届试题,其中主要运用平衡条件求解的就有五道题,占20分。其中较为典型的是第10、13、21、33四道题,现主要就第10道题为例谈这类考题的特色和解题规律。就考查知识而言,第13、21题涉及在共点力作用下物体的平衡问题;第10、33题涉及有固定转动轴的物体的平衡问题,可以说,四道题概括了高中物理中有关物体平衡的全部内容。第21题以多选题形式出现,第33题以力
In 1990, the proportion of questions relating to the balance of objects in the physics test of college entrance examinations was significantly higher than that of previous examination questions. There are five questions that are mainly used to solve the equilibrium conditions, accounting for 20 points. Among them, the 10th, 13th, 21st, and 33th questions are more typical. Now, the 10th topic is used as an example to discuss the features and the law of solving problems. As far as the examination of knowledge is concerned, questions 13 and 21 deal with the balance of objects under the action of common forces; questions 10 and 33 deal with the balance of objects with fixed axes of rotation. It can be said that the four questions summarize high school physics. Everything about object balance. Question 21 appears in the form of multiple choice questions.