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场内物体平衡问题是高考的重点考查内容,处理平衡问题的基本思路:确定平衡状态(加速度为零)→巧选研究对象(整体法或隔离法)→受力分析→建立平衡方程→求解或作讨论.常用的方法:(1)在判断弹力或摩擦力是否存在以及确定方向时常用假设法.(2)求解平衡问题时常用二力平衡法、矢量三角形法、正交分解法、相似三角形法、图解法等,常见有以下题型:题型一整体法和隔离法在受力分析中的应用例1(2013·武汉模拟)如右图所示,固定在水平地面上的物体P,左侧是光滑圆弧面,一根轻绳跨过物体P
Field balance problem is the focus of examination of the college entrance examination content to deal with the basic idea of the problem of balance: to determine the equilibrium state (zero acceleration) → Qiao election research object (overall or isolation method) → force analysis → balance equation → solution or Commonly used methods: (1) In the judgment of elastic force or friction exists and determine the direction often used when the hypothesis. (2) To solve the balance problem often used two balance method, vector triangle method, orthogonal decomposition method, similar to the triangle Law, graphic method, etc., common have the following questions: a question and a holistic method and isolation method in the force analysis of Example 1 (2013 · Wuhan simulation) as shown on the right, fixed on a horizontal ground object P, On the left is a smooth arc, a light rope across the object P