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Newton's first law of motion states that an object in a state of rest or uniform motion will remain in that state unless an external force is applied.
This is normally taken as the definition of inertia. If there is no net force acting on an object then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest.
Newton's Laws of Motion:

## Newton's laws of motion - Wikipedia

en.wikipedia.org/wiki/Newton's_laws_of_motion

The first law states that if the net force (the vector sum of all ... Newton placed the first law of motion to establish frames of ...

## Newton's First Law of Motion - The Physics Classroom

www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law

These three laws have become known as Newton's three laws of motion. The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law ...

## Newton's First Law of Motion

teachertech.rice.edu/Participants/louviere/Newton/law1.html

An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same ...

## Newton's First Law of Motion - NASA

www.grc.nasa.gov/www/k-12/airplane/newton1g.html

Sir Isaac Newton first presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. His first law states that every object will ...

## What is Newton's first law? | Newton's laws of motion | Forces and ...

We can think of this law as preserving the status quo of motion. Newton's first law of motion states that there must be a cause—which is a net external force—for ...

## Newton's Laws - HyperPhysics

hyperphysics.phy-astr.gsu.edu/hbase/Newt.html

Any change in motion involves an acceleration, and then Newton's Second Law applies; in fact, the First Law is just a special case of the Second Law for which ...