浅析刚体平面运动的动力学方程

Superficial Analysis of Dynamic Equations of a Rigid Body in Planar Motion

刚体作平面运动有3个自由度，因此求解刚体平面运动的动力学问题需要3个独立的动力学方程．由于动量定理（含质心运动定理）。动能定理和动量矩定理并不是相互独立的，而且参照系可以是惯性系，也可以是非惯性系，所以刚体平面运动3个独立的动力学方程就有不同的选择方法．

When a rigid body moves on a plane, it has 3 dimensions of freedom, so it needs 3 equa-tions when solving dynamic problems in this case. Since theorem of momentum(including theorem ofmoving mass center), theorem of kinetic energy and theorem of momant are not independent, and refer-ence system can be inertial system or noninertial system, so it has various methods t0 choose those 3different and independent dynamic equations.