Translation guide
The force or energy that makes something move, especially in mechanical or physical contexts.
The physical power source that moves a machine, vehicle, or mechanism.
Something that motivates or drives a person, project, or change.
この機械は電気を動力としている。
This machine uses electricity as its motive power.
Often implies the original or fundamental driving force, can be used metaphorically.
蒸気機関が産業革命の原動力となった。
The steam engine became the driving force of the Industrial Revolution.
ロケットの推進力は燃料の燃焼によって生まれる。
A rocket's propulsive force is generated by fuel combustion.
Commonly used for the main motivation or impetus behind an action or movement.
彼の成功の原動力は家族への愛情だ。
The driving force behind his success is his love for his family.
Can be used figuratively but less common than 原動力; sounds slightly more mechanical.
好奇心が彼の研究の動力だ。
Curiosity is the motive power behind his research.