力学是现代工程技术的应用基础 .一般我们在分析理想的力学问题时 ,常常假定物体的接触表面是完全光滑的 ,事实上 ,完全光滑的表面并不存在 ,在许多实际问题中 ,摩擦往往有很重要的应用 .例如 :在工程技术中传动、制动、夹紧和自锁等都是依靠摩擦来实现的 ,这是有利的一面 ;另 Mechanics is the basic application of modern engineering technology. Generally, when we analyze ideal mechanical problems, we often assume that the contact surfaces of objects are completely smooth. In fact, completely smooth surfaces do not exist. In many practical problems, friction often occurs. Very important applications. For example, in engineering technology, transmission, braking, clamping, and self-locking are all based on friction. This is an advantage;