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共点力作用下物体的平衡是学生学习物理第一次综合应用几何知识解决物理问题.解决过程中可用较多方法,比如三角函数,相似三角形,正弦定理,余弦定理,正交分解法等.同时解决多个物体的平衡问题时还要使用整体法与隔离法,对学生来说综合性较强,难度相对较高.本文就共点力平衡的几种基本方法进行探讨.共点力平衡的一般解题步骤:1.确定研究对象;2.受力分析;3.画力的矢量图;4.运用力的合成法或分解法建立方程求解.方法一解三角形法若物体处于三力平衡,则其中两力的合力必与第三力等大、反向.那么,这三个力平移其中两个,必能围成一个矢量三
A total of force under the balance of objects is the first time students learn the physical application of physical knowledge to solve the physical problems. The process of solving more available methods, such as trigonometric functions, similar triangles, sine, cosine, orthogonal decomposition method. At the same time to solve the balance of multiple objects but also to use the overall law and isolation law, comprehensive and strong for students, the difficulty is relatively high.This article on the total balance of several basic methods are discussed. Of the general problem-solving steps: 1. Determine the object of study; 2. Force analysis; 3. Painter’s vector diagram; 4. Using force synthesis or decomposition method to establish equations to solve. Triangulation method if the object is in force Balance, then the force of the two of them will be large and the opposite of the third force, etc. Then, if the three forces translate two of them, they will form a vector three