Keith Mack
Newton's first law of motion, often paraphrased as objects in motion tend to stay in motion, and objects at rest tend to stay at rest, was first introduced in 1686 in Newton's Principia Mathematica Philosophiae Naturalis. The law states that an object will not change its motion unless a force acts on it. This tendency to resist changes in a state of motion is known as inertia. The law of inertia was first formulated by Galileo Galilei for horizontal motion on Earth and was later generalized by René Descartes. Newton's first law of motion revolutionized science and provided the basis for modern physics.
| Characteristics | Values |
|---|---|
| Person who discovered the first law of motion | Sir Isaac Newton |
| First law of motion | Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force |
| Other names for the first law of motion | The law of inertia, Newton's Zeroth Law, Newton's first law, inertial motion |
| Date of discovery | 1686 or 1687 |
| Publication | "Philosophiæ Naturalis Principia Mathematica" or "Mathematical Principles of Natural Philosophy" |
| Language of the publication | Latin |
| Newton's profession | Physicist and mathematician |
| Basis of modern physics | Yes |
| Newton's other works | Theories of gravitation |
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What You'll Learn
Newton's first law and the law of inertia
Newton's first law of motion, often referred to as the law of inertia, was first stated by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica, originally published in 1687. This law states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless acted upon by an unbalanced force. This principle is also known as the law of inertia, which was first formulated by Galileo Galilei for horizontal motion on Earth and later generalized by René Descartes.
Newton's first law expresses the natural behaviour of a body to move in a straight line at a constant speed. This tendency to resist changes in the state of motion is known as inertia. In other words, an object will not change its motion unless a force acts on it. This law also implies that there is no way to determine which inertial observer is truly moving and which is truly at rest. From the perspective of an inertial observer, a person standing on the ground watching a train go past is an example of an inertial observer. If the observer on the ground sees the train moving, a passenger sitting on the train will also be an inertial observer as they feel no motion.
Newton's first law is a fundamental assumption of classical mechanics and provides the basis for modern physics. It is important to note that while Newton's laws of motion are foundational, they do have limitations. New theories are necessary when dealing with objects moving at extremely high speeds (special relativity), massive objects (general relativity), or very small objects (quantum mechanics).
The discovery of Newton's first law and the law of inertia was a significant contribution to our understanding of the relationship between objects and the forces acting upon them. This law has helped revolutionize science and provided a basis for further exploration in physics and mathematics.
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$6.8
The three laws of motion
First Law of Motion
Newton's first law expresses the principle of inertia: an object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force. This tendency to resist changes in a state of motion is inertia. In other words, the natural behaviour of a body is to move in a straight line at a constant speed. A body's motion preserves the status quo, but external forces can perturb this. Newton himself believed that absolute space and time existed, but that the only measures of space or time accessible to experiment are relative.
Second Law of Motion
Newton's second law defines a force to be equal to the change in momentum (mass times velocity) per change in time. The force on an object is equal to its mass times its acceleration. The acceleration of an object depends on the mass of the object and the amount of force applied.
Third Law of Motion
Newton's third law states that for every action (force) in nature, there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A. In other words, forces result from interactions.
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Limitations of Newton's laws
Newton's three laws of motion, first stated in 1687, explain the relationship between a physical object and the forces acting upon it. They are the foundation of classical mechanics, a branch of physics.
Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless acted upon by an external force. This law was deduced by Galileo Galilei from his experiments with balls rolling down inclined planes.
While Newton's laws of motion revolutionized science, they do have limitations. New theories are necessary when objects move at very high speeds (special relativity), are very massive (general relativity), or are very small (quantum mechanics). For example, in special relativity, Newton's second law holds, but the definition of momentum is modified. As a result, no matter how much force is applied, a body cannot be accelerated to the speed of light.
Additionally, Newton's laws are often stated in terms of point or particle masses, neglecting the motion of internal parts. This is a reasonable approximation for real bodies when the separation between bodies is much larger than their size.
Furthermore, Newton's laws assume a constant mass, which may not hold true for objects like bottle rockets, where the mass changes due to fuel consumption. In such cases, only changes in momentum can be considered.
Newton's laws also do not account for the rotational motion of the Earth's surface, which causes small deviations from the expected motion. These limitations highlight the need for additional theories to complement Newton's laws when dealing with extremely fast, massive, or tiny objects, as well as situations involving complex internal motions or changing masses.
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Newton's first law in modern understanding
Newton's first law of motion, also known as the law of inertia, states that an object will not change its motion unless compelled to do so by a force. In other words, an object at rest remains at rest, and an object in motion stays in motion at a constant speed and in a straight line. This principle was first formulated by Galileo Galilei for horizontal motion on Earth and was later generalized by René Descartes.
Newton's first law expresses the principle of inertia, which states that the natural behaviour of a body is to move in a straight line at a constant speed. In modern understanding, Newton's first law implies that no inertial observer is privileged over any other. This means that there is no way to say which inertial observer is "really" moving and which is "really" standing still. For example, a person standing on the ground watching a train go past is an inertial observer. If the observer on the ground sees the train moving smoothly in a straight line at a constant speed, then a passenger sitting on the train will also be an inertial observer, as the train passenger feels no motion.
Newton's three laws of motion were first stated in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), originally published in 1687. These laws were developed to explain the motion of many physical objects and systems, particularly why planetary orbits are ellipses rather than circles. Newton's work built upon the concepts of his predecessors, including Galileo Galilei, Johannes Kepler, René Descartes, and Nicolaus Copernicus, and laid the foundation for classical mechanics.
While Newton's laws of motion have been integral to our understanding of physics, they do have limitations. New theories are necessary when objects move at very high speeds (special relativity), are very massive (general relativity), or are very small (quantum mechanics).
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Newton's first law and the concept of an inertial observer
Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless compelled to change by an external force. This tendency to resist changes in the state of motion is called inertia. Newton's first law expresses the principle of inertia, which states that the natural behaviour of a body is to move in a straight line at a constant speed.
The concept of an inertial observer is integral to understanding Newton's first law. An inertial observer is someone who perceives no effects of motion. For example, a person standing on the ground watching a train go past is an inertial observer. If the observer on the ground sees the train moving smoothly in a straight line at a constant speed, then a passenger sitting on the train will also be an inertial observer, as they feel no motion. This is because, in classical Newtonian mechanics, there is no distinction between rest and uniform motion in a straight line. These can be regarded as the same state of motion seen by different observers, one moving at the same velocity as the particle and the other moving at a constant velocity concerning the particle.
The modern understanding of Newton's first law is that no inertial observer is privileged over any other. In other words, there is no way to say which inertial observer is "really" moving and which is "really" standing still. No experiment can deem either point of view to be correct or incorrect. There is no absolute standard of rest. Newton himself believed that absolute space and time existed, but the only measures of space or time accessible to experiment are relative.
Newton's first law of motion was first stated in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), originally published in 1687. Newton's three laws of motion were formulated to explain the motion of many physical objects and systems, particularly why planetary orbits are ellipses rather than circles. Newton's work built upon the earlier work of scientists such as Galileo Galilei, Johannes Kepler, René Descartes, and Nicolaus Copernicus.
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Frequently asked questions
The first law of motion, also known as the law of inertia, states that an object will not change its motion unless compelled to do so by a force. In other words, an object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless acted on by an unbalanced force.
The first law of motion was formulated by Sir Isaac Newton and published in his 1687 book, "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy).
The law of inertia states that an object at rest will remain at rest, and an object in motion will remain in motion unless acted upon by an external force. This principle was first formulated by Galileo Galilei through his experiments with balls rolling down inclined planes. Galileo's work helped explain why we do not sense the Earth's motion, as our natural tendency is to retain our motion relative to the Earth.
Newton built upon the work of previous scientists such as Galileo Galilei, Johannes Kepler, René Descartes, and Nicolaus Copernicus. He combined knowledge of celestial motions with the study of events on Earth, creating a single theory of mechanics that could explain both. Newton's three laws of motion revolutionized science and served as the foundation for classical mechanics.
