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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

According to Newton's first law. ... An object in motion continues in motion with the same speed and in the ... All objects resist changes in their state of motion.

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 ...

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.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-1st-law-of-motion

In science my teacher said that theres a lot of weight pushing us down because theres a lot of air above us and he said our body is pushing back but how can ...

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-first-law-of-motion

Einstein made a small correction which is that mass is a function of velocity and the speed of light is constant in all reference frames, but other than that, ...

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 ...