Where do inertial frames come from?
惯性系从何而来？
Inertial frames... what is stationary? The ether (aether)?
惯性系…什么是静止？以太吗？
The class of all possible motions is the same in all inertial frames.
在所有的惯性参照系中可能出现的运动全都是同一种类的。
With the help of the simple mathematical method, another transformation formula of coordinates and time between the radius vector equations in inertial frames is derived in the paper.
本文运用简单的数学方法推导出惯性系矢径方程的另一种坐标和时间变换式。
Like the First Law, the Second Law only holds in inertial reference frames.
第二定律如第一定律，也只在惯性参考系下成立。
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。
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。
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