论文部分内容阅读
在力学中,几个常用的定律和定理是:牛顿第二定律、动量原理、动量守恒定律、动能定理、功能原理和机械能守恒定律等。它们反映了物体运动所遵循的基本规律,是解决力学问题的钥匙和原则。其中最重要的或者最基本的是牛顿定律,其余各条定律和定理都是在它的基础上利用运动学的公式,根据一定的条件而推导出来的。其内在关系可用下例阐明。今有一斜面(如图1所示),其底边和斜面的夹角为θ。某一质量为m的物体,在恒力f
In mechanics, several common laws and theorems are: Newton’s second law, principle of momentum, law of conservation of momentum, kinetic energy theorem, functional principle, and conservation of mechanical energy. They reflect the basic rules followed by the movement of objects and are the keys and principles for solving mechanical problems. The most important or basic one is Newton’s law. The rest of the laws and theorems are based on its formula using kinematics and derived from certain conditions. Its internal relationship can be illustrated by the following example. There is a slope (as shown in Figure 1), and the angle between the base and the slope is θ. An object of mass m in constant force f