刚体动力学是由外力的作用下相互关联的机构系统的运动。假设该机构是刚性的，这意味着他们不施加力的作用下发生变形，而简化了分析。 然而被定义为刚体系统动力学的运动方程序，这是可以使用牛顿运动或拉格朗日力学定律推导而来。这些运动方程的解决方法,是以刚体的变化作为时间的函数系统所配置。

Rigid-body dynamics studies the movement of systems of interconnected bodies under the action of external forces. The assumption that the bodies are rigid, which means that they do not deform under the action of applied forces, simplifies the analysis by reducing the parameters that describe the configuration of the system to the translation and rotation of reference frames attached to each body. This excludes bodies that display fluid highly elastic, and plastic behavior.