Newton's first law
Also known as Newton's first law of motion, inertia law, principle of inertia
physical law that the natural behavior of a body is to move in a straight line at constant speed, such that there are no privileged inertial observers
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Newton's first law states that an object naturally moves in a straight line at a constant speed, and will keep doing so unless something acts upon it to change that motion. This law matters because it established the fundamental principle that motion itself doesn't require a cause—only changes in motion do—which became a cornerstone of how we understand physics.
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Newton's laws of motion are three physical laws that describe the relationship between the motion of an object and the forces acting on it. These laws, which provide the basis for Newtonian mechanics, can be paraphrased as follows:
A body remains at rest, or in motion at a constant speed in a straight line, unless it is acted upon by a force.