What does "newton's first law" mean?

a body remains at rest or in motion with a constant velocity unless acted upon by an external force

Newton's first law

Common synonyms include: first law, first law of motion, first law principle, inertia based concept, inertia concept, inertia law.

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Noun

1
a body remains at rest or in motion with a constant velocity unless acted upon by an external force wordnet

Proper Noun

1
The observation that objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.