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first law of motion

 

Definitions from WordNet

Noun first law of motion has 1 sense
  1. first law of motion, Newton's first law of motion, Newton's first law - a body remains at rest or in motion with a constant velocity unless acted upon by an external force
    --1 is a kind of Newton's law of motion, Newton's law, law of motion

Definitions from the Web

First Law of Motion

Noun: The first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force.

Example Sentence: According to the first law of motion, a ball thrown into the air will continue moving upward until gravity slows it down and causes it to fall.

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