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力学是整个高中物理学习的基础,而力的合成和分解类问题却是学生必须熟练掌握的重要题型之一。众所周知,求解合力与分力的基本方法是应用“平行四边形定则”。原则上讲,该方法能够求解所有力的合成、分解问题。事实上,有的问题解决起来并不容易。但利用力三角形定则来等效替代它可以使很多问题迅速得到解决,而且非常简单明了。所谓“三角形定则”就是把代表两个的有向线段首尾相连,则合力就从第一个的起点到第二个矢量的末端,如图1。若一个物体在三个共点力作用下处
Mechanics is the basis of the entire high school physics study, and the synthesis and decomposition of forces is one of the important questions that students must master. As we all know, the basic method to solve the resultant force and force component is to use “parallelogram principle”. In principle, this method can solve all the forces of synthesis, decomposition problems. In fact, some problems are not easy to solve. However, the use of force triangulation to replace it equitably can solve many problems quickly and is straightforward. The so-called “triangular rule ” is connected to the line segment representing the two end to end, the resultant force from the beginning of the first to the end of the second vector, shown in Figure 1. If an object in a total of three points under the force