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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:

en.wikipedia.org/wiki/Newton%27s_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 ...

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 ...

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 ...

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/a/what-is-newtons-first-law

Newton's first law of motion states that there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude ...

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

May 5, 2015 ... Sir Isaac Newton first presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. His first law states that ...

.ask.com/youtube?q=Newton%27s+First+Law+of+Motion&v=LEHR8YQNm_Q
May 6, 2015 ... You will learn about "Newton's First Law of Motion" in this video. Sir Isaac Newton was one of the greatest influential scientists of all time.
.ask.com/youtube?q=Newton%27s+First+Law+of+Motion&v=08BFCZJDn9w
Jan 27, 2015 ... "Science of NFL Football" is a 10-part video series funded by the National Science Foundation and produced in partnership with the National ...

www.livescience.com/46559-newton-first-law.html

Jun 26, 2014 ... Newton's First Law of Motion states, “A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an ...

science360.gov/obj/video/70fadaa8-c3d4-4132-ba1f-c98be5caeb14/science-nfl-football-newtons-first-law-motion

In this segment, NBC's Lester Holt explores Isaac Newton's First Law of Motion and how it helps or hinders a player's ability to move the football down the field as ...