dynamics和kinetics在用法上有什么区别？

dynamics的意思比kinetics要广很多，以下是dynamics的释义，只有第一义项下两者可以通用。
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1）(used with a sing. verb)The branch of mechanics that is concerned with the effects of forces on the motion of a body or system of bodies, especially of forces that do not originate within the system itself.Also called kinetics
（与单数动词连用）动力学：机械学的分支，有关各种力量在运动体或运动体系统上的作用，尤指非系统本身产生的力也作 kinetics

2）(used with a pl. verb)The forces and motions that characterize a system:
（与复数动词连用）动态：可代表这种系统的各种力或其运动：
The dynamics of ocean waves are complex.
海浪的运动是复杂的

3）(used with a pl. verb)The social, intellectual, or moral forces that produce activity and change in a given sphere:
（与复数动词连用）社会力量：社会的、理智的或道德的力量，它在一定范围内产生运动与变化：
The dynamics of international trade have influenced our business decisions on this matter.
国际贸易的动态影响了我们对此所作的商务决定

4）(used with a pl. verb)Variation in force or intensity, especially in musical sound:
（与复数动词连用）力度变化：力度上的变化，尤指音乐中：