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.
The steam engine became the driving force of the Industrial Revolution.
A rocket's propulsive force is generated by fuel combustion.
Commonly used for the main motivation or impetus behind an action or movement.
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.
Curiosity is the motive power behind his research.