Modeling an inverted pendulum. Generally the inverted pendulum system is modeled as a linear system, and hence the modeling is valid only for small oscillations of the pendulum.
为倒立摆建模。通常倒立摆系统建模成一个线形系统，因此模型只对小幅度摆动的摆才有效。
Newtonian dynamics: first, second and third laws, inertial and non-inertial reference frames, conservation laws, forces and potentials, gravitational field, central forces, small oscillations.
牛顿力学：牛顿第一、二、三定律，惯性和非惯性参考系，牛顿守恒定律，力和潜能，重力场，向心力，低频振荡。
The bullet has a small magnet inside that lets it generate AC current as it spins and a microprocessor that measures those current oscillations to derive how far it's traveled.
子弹藏有一块小磁铁和一颗芯片，子弹旋转带动小磁铁产生直流电，芯片通过电流波动感知射程的远近。
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