专题1 准静态问题的力三角形判断法

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当今市场上各种高中物理竞赛辅导资料多以章节的形式罗列知识点 ,方法辅导较少 ,不利于激发学生学习的兴趣 .因此 ,许多老师要求本刊编辑部组织一个有别于市场上的竞赛辅导资料 ,以给喜欢物理学 ,渴求获得比高中教材所提供的更多的基础物理知识与更妙的解决物理问题方法的中学生一套课外阅读材料 ,也便于普通中学用作竞赛辅导并且与高中现行物理教学同步的教材 ,在编排上 ,知识线与高中现行物理教材平行 .对此 ,本刊编辑部特邀资深竞赛辅导老师———浙江省特级教师、宁波效实中学高级教师沈晨老师编写高中物理竞赛辅导专题 .该专题内容以《全国中学生物理竞赛内容提要》为依据 ,不拘泥于其界定 .数学涉及高中现行教材全部内容 ,但不需要用到微积分 ,对部分求导、积分与微分方程通过微元方法降解 ,是初等数学的物理 ;对高中物理内容不再作知识点的罗列 ,采用“点击式”介绍更高层面的物理知识 ,更巧妙的物理方法 ;例讲选题注重给学生以解决物理问题的具体操作方法与新信息传达 ;练习题全部给出详解或解答指要 ;选编练习题尽少重复全国物理竞赛试题以增大新题容 ;国际物理奥林匹克题降解选用比例高 .每个专题分“教你一手”与“小试身手”两个模块 ,前者点击精彩物理知识与方法 ,后者提供研讨、试手的问? At present, various high school physics contest counseling materials on the market are mostly listed in chapters, and there are fewer methods to guide them. This is not conducive to stimulating students’ interest in learning. Therefore, many teachers require the editorial department of the journal to organize a contest that is different from the market. Coaching materials for secondary school students who like physics and are eager to obtain more basic physics knowledge and better ways of solving physical problems than high school textbooks. They also facilitate the use of general secondary schools as competition coaching and high schools. The current physics teaching synchronization textbooks, in the layout, the knowledge line and the current physical textbooks in high school parallel. In this regard, the editorial department of the magazine specially invited senior competition counseling teacher - Zhejiang special grade teacher, senior teacher Chen Shen Chen Senior Middle School teacher Prepare tutorial topics for high school physics competitions. This topic is based on the “National Secondary School Students’ Physics Contest Summary” and is not limited to its definition. Mathematics involves all the contents of the current high school textbooks, but does not require the use of calculus, partial derivative, and integral The degradation of differential equations by means of microelements is the physics of elementary mathematics; the physical content of high school List of knowledge points again, using “click-through” to introduce higher-level physics knowledge, more clever physics methods; example topics focus on giving students specific methods of operation and new information to solve physical problems; exercises to all Detailed explanations or answers are required; selection of exercises to minimize repetition of national physics contest questions in order to increase new topics; International Physics Olympics has a high percentage of selection for degradation. Each topic is divided into two categories: “Teach you one hand” and “Small test skills.” The module, the former clicks the wonderful physics knowledge and the method, the latter provides the discussion, the examination question?
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