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Newton's first law expresses the principle of inertia: the natural behavior of a body is to move in a straight line at constant speed. A body's motion preserves the status quo, but external forces can perturb this. The modern understanding of Newton's first law is that no inertial observer is privileged over any other. The concept of an ...
Inertia is the natural tendency of objects in motion to stay in motion and objects at rest to stay at rest, unless a force causes the velocity to change. It is one of the fundamental principles in classical physics, and described by Isaac Newton in his first law of motion (also known as The Principle of Inertia). [1]
(This reappears in Definition 5 of the Principia.) 2: 'Inherent force' of a body is defined in a way that prepares for the idea of inertia and of Newton's first law (in the absence of external force, a body continues in its state of motion either at rest or in uniform motion along a straight line). (Definition 3 of the Principia is to similar ...
The first degree consists of clear and evident notions that can be acquired without the need for any meditation. The second degree is all that is learned by means of the senses. The third comprises what we learn when talking with others. The fourth consists of what we can learn from the writings of those capable of giving good instructions.
Let's move on to law number two. I didn't intend this parallelism, but just as law number one was Newton's first law of motion, law number two is actually Arthur C Clarke's second law. Arthur C ...
Within the realm of Newtonian mechanics, an inertial frame of reference, or inertial reference frame, is one in which Newton's first law of motion is valid. [17] However, the principle of special relativity generalizes the notion of an inertial frame to include all physical laws, not simply Newton's first law.
Linear motion is the most basic of all motion. According to Newton's first law of motion, objects that do not experience any net force will continue to move in a straight line with a constant velocity until they are subjected to a net force.
Mathematically, each physical law can be expressed with respect to the coordinates given by an inertial frame of reference by a mathematical equation (for instance, a differential equation) which relates the various coordinates of the various objects in the spacetime. A typical example is Maxwell's equations. Another is Newton's first law. 1.