※ 引述《lilin (Instant Aura)》之铭言： 前删 : 请大家参考看看。 : 我自己的印象是，在一般文献中dynamics常和kinetics混用，mechanics则是统称。 这两个怎麽会混用啊..... 要说也是Kinematics和Kinetics这两个用dynamics来统称 而且在Beer & Johnston的动力学课本里面一开就解释过Dynamics是啥了 课本一开始的地方没有跳过没看的话应该是不会搞错这两个词才对 把以前的文翻出来贴 （第三版，P.584） Dynamics includes: 1. Kinematics, which is the study of the geometry of motion. Kinematics is used to relate displacement, velocity, acceleration, and time, without reference to the cause of motion. 2. Kinetics, which is the study of the relation existing between the forces acting on a body, the mass of body, and the motion of body. Kinetics is used to predict the motion caused by given forces or to determine the forces required to produce a given motion. Kinematics是探讨的运动各物理量（但是不会出现力与质量）之间的关系 而此关系的状态会一直持续，不会改变 Kinetics则是探讨运动与力的关系（还会有质量影响） 而此关系为预测未来可能会出现的变化 最好判断的就是使用NT 2nd Law的就是Kinetics，因为Kinetics才会提到力 力会改变运动状态，要计算出被改变的运动状态 无使用到NT 2nd Law的就是Kinematics，所以运动状态将持续不改变 -- Deserves death! I daresay he does. Many that live deserve death. And some die that deserve life. Can you give that to them? Then be not too eager to deal out death in the name of justice, fearing for your own safty. Even the wise cannot see all ends. Gandalf to Frodo --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.225.198.127 ※ 编辑: Gwaewluin 来自: 61.225.198.127 (08/12 18:29)