在物理习题中常遇到极值求解的问题,本文介绍几种求极值的方法,供大家参考.一、几何法如果物理量在几何图形上变化时,可借助几何知识求其极值.例1物体重为mg,轻绳OA、OB固定在物体上的同一点上,绳OA另一端固定在天花板上,如图1(a)所示,用力拉绳OB,使绳OA与竖直方向夹角α保持不 In the physical exercises often encounter the problem of solving the extreme value, this article describes several methods for seeking the extreme value, for your reference. First, the geometric method If the physical quantity changes in the geometry, you can use geometry knowledge to find the extreme value. Example 1 The weight of the object is mg. The light ropes OA and OB are fixed on the same point on the object. The other end of the rope OA is fixed on the ceiling. As shown in FIG. 1(a), the rope OB is pulled hard to clamp the rope OA and the vertical direction. Angle α does not remain