first law of motion
Noun
Meaning
a body remains at rest or in motion with a constant velocity unless acted upon by an external force
Source: WordNetSynonyms
Hypernyms
Examples
Like Newton's first law of motion, Einstein's theory states that if a force is applied on an object, it would deviate from a geodesic.
Newton's first law of motion has here been split into two parts, the first two laws.
The law of inertia is also known as Isaac Newton's first law of motion.