law of conservation of moment of momentum

例句：

1. 1.The motion of the ball is described by the equation of motion.
   球的运动由运动方程描述。
2. 2.The moment of inertia of a body is defined as its mass times its moment of inertia.
   物体的转动惯量定义为其质量乘以转动惯量。
3. 3.In the field of mechanics, the conservation of momentum is fundamental to understanding the behavior of objects under force.
   在力学领域，动量守恒是理解物体受力作用行为的基础。