物理学是应用数学方法最充分、最成功的一门科学.数学方法是物理思维和数学思维高度融合的产物.笔者只就矢量三角形和几何三角形相似的应用作以说明,希望能够抛砖引玉.当物体所受三力中的两个发生变化而又维持着平衡关系时,这个闭合三角形总是存在.只不过形状变化而已.比较不同形状的矢量三角形,各力的大小及方向变化情况就一目了然了.这时想方设法寻求与力构成的矢量三角形相似的由支架、细绳等构成的几何三角 Physics is the most fully and successfully applied science in mathematics. Mathematical methods are the result of a high degree of fusion of physical thinking and mathematical thinking. The author only explains the similar applications of vector triangles and geometric triangles. I hope to be able to introduce jade. When two of the three forces involved change and maintain a balanced relationship, the closed triangle is always present. It is only a change of shape. Comparing the vector triangles of different shapes, the magnitude and direction change of each force is clear at a glance. At this time, we try to find a geometric triangle consisting of a bracket, a string, etc. similar to the vector triangle formed by force.