Principle of equivalence

Japanese: principle of equivalence（英語表記）principleofequivalence

...The reason is that in non-inertial systems, inertial forces appear, which have exactly the same properties as gravity due to the equivalence principle described below.
[principle of equivalence]
There are two types of mass in Newtonian mechanics. The first is the inertial mass m _I , which appears on the left side of the equation of motion, m _I α＝ f …(6), and represents the magnitude of inertia and has no direct relationship to gravity (α is acceleration, f is force). …

*Some explanations of terms that refer to "principle of equivalence" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…その理由は，非慣性系では慣性力が現れるが，これは，次に述べる等価原理のために重力とまったく同じ性質をもつことにある。
［等価原理principle of equivalence］
　ニュートンの力学には2種類の質量が登場する。第1は慣性質量m_Iで，運動方程式，　m_Iα＝f　　……(6)　の左辺に現れ，慣性の大小を表すものであって重力とは直接の関係がない(αは加速度，fは力)。…

※「principle of equivalence」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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