Keith Mack
Isaac Newton is credited with discovering the laws of gravity and motion, which he outlined in his 1687 book, *Philosophiæ Naturalis Principia Mathematica* (usually referred to as the Principia). Newton's law of universal gravitation describes gravity as a force stating that every particle attracts every other particle with a force that is proportional to their mass and inversely proportional to the square of the distance between them.
| Characteristics | Values |
|---|---|
| Name | Isaac Newton |
| Law | Newton's law of universal gravitation |
| Year of development | 1666 |
| Year of publication | 1687 |
| Publication | "Philosophiæ Naturalis Principia Mathematica" (Latin for "Mathematical Principles of Natural Philosophy"), generally referred to as the "Principia" |
| Description | Describes gravity as a force stating that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers of mass |
| Formula | F = G * (m1 * m2) / r^2, where F is force, G is the gravitational constant, m1 and m2 are the masses of the two particles, and r is the straight-line distance between the two particles |
| First Law | 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 |
| Second Law | A force is equal to the change in momentum (mass times velocity) per change in time |
| Third Law | For every action (force) in nature, there is an equal and opposite reaction |
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What You'll Learn
Isaac Newton's discovery
Isaac Newton is credited with discovering the laws of gravity and motion and inventing calculus. He is said to have been inspired by an apple falling from a tree in his mother's garden. Newton himself recounted this story to several contemporaries, who recorded it for posterity. Newton's law of universal gravitation describes gravity as a force stating that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centres of mass.
Newton developed his theory of gravitation in 1666 at the age of 23. He presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. Newton's laws, together with Johannes Kepler's laws, explained why planets move in elliptical orbits rather than circles. Kepler's laws of planetary motion summarised Tycho Brahe's astronomical observations. Newton developed the idea that Kepler's laws must also apply to the orbit of the Moon around the Earth and then to all objects on Earth. This analysis required assuming that the gravitation force acted as if all of the mass of the Earth were concentrated at its centre, an unproven conjecture at the time.
Newton's law of gravity marked the unification of previously described phenomena of gravity on Earth with known astronomical behaviours. This is a general physical law derived from empirical observations by what Newton called inductive reasoning. It is a part of classical mechanics and was formulated in Newton's work "Philosophiæ Naturalis Principia Mathematica" (Latin for "Mathematical Principles of Natural Philosophy"), first published on 5 July 1687. Newton's three laws of motion give us the tools to interpret the motion caused by the force and help us understand why light objects fall to the Earth considerably faster than the Earth falls toward them.
Newton's theory of gravity was later superseded by Albert Einstein's theory of general relativity, but the universality of the gravitational constant remains intact, and the law continues to be used as an excellent approximation of the effects of gravity in most applications. Relativity is required only when extreme accuracy is needed or when dealing with very strong gravitational fields, such as those found near extremely massive and dense objects or at small distances, such as Mercury's orbit around the Sun.
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Rivalry with Robert Hooke
Isaac Newton is credited with discovering the laws of gravity, which describe gravity as a force stating that every particle attracts every other particle with a force proportional to their mass and inversely proportional to the square of the distance between them.
Isaac Newton and Robert Hooke were rivals, with both men attempting to forge reputations as the greatest scientific minds of their age. The rivalry began in 1672 when Newton submitted his first paper on the nature of light to the Royal Society. Newton claimed that white light was a composite of all the colours of light in the spectrum and that light was composed of particles. Hooke disagreed, stating that light travelled in waves. He attacked Newton's methods and conclusions, and other scientists joined in the criticism. Newton responded angrily and defensively, and the rivalry escalated. In 1673, Newton even threatened to leave the Royal Society, only staying after being persuaded by the Society's Secretary, Henry Oldenburg.
Hooke was the Curator of Experiments for the Royal Society and had contributed to many areas of science, including mechanics, optics, microscopy, paleontology, and astronomy. He had access to more resources than Newton and was a bigger name in the scientific community. Newton, on the other hand, was defensive about his work and wanted to protect it from others.
In 1676, Hooke accused Newton of plagiarism, claiming that Newton copied his theory on light from his journal, "Micrographia". However, Hooke himself was accused of wanting all the credit for his work, despite others approaching him and claiming they had come up with some of his ideas first.
Newton became president of the Royal Society after Hooke's death in 1703, and some say he tried to tarnish Hooke's reputation. The only portrait of Hooke was removed from the Royal Society during Newton's presidency, and Hooke's legacy deteriorated while Newton's grew. Newton's famous quote, "If I have seen further than others, it is by standing upon the shoulders of giants," is believed to be a passive-aggressive attack on Hooke, who was significantly shorter than Newton.
Through history, Newton became the undisputed winner of this scientific rivalry, and Hooke's contributions were largely erased.
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Development of the scientific method
Isaac Newton is credited with formulating the three laws of gravity in 1687, in his work 'Philosophiæ Naturalis Principia Mathematica' (Latin for 'Mathematical Principles of Natural Philosophy'), often referred to as 'Principia'. However, the development of the scientific method that led to this formulation has a long and complex history, dating back to ancient civilisations.
The scientific method is an empirical process for acquiring knowledge, involving careful observation, rigorous scepticism, and inductive reasoning. While the term "scientific method" emerged in the 19th century, the underlying principles and practices have evolved over centuries, with contributions from various cultures and disciplines.
One of the earliest known applications of a scientific method can be traced back to ancient Egypt. The Edwin Smith papyrus (c. 1600 BCE), an Egyptian medical textbook, describes a systematic approach to treating diseases through examination, diagnosis, treatment, and prognosis, demonstrating early empirical thinking. Around the same time, ancient Indian schools, such as Nyaya, Vaisheshika, and Buddhist schools, also explored rationalist explanations of nature, including atomism.
In ancient Greece, Aristotle played a pivotal role in pioneering scientific methodology alongside his contributions to empirical biology and logic. He developed a normative approach to scientific inquiry, utilising syllogism and rejecting purely deductive frameworks in favour of generalisations based on observations.
During the 11th century, Avicenna, a philosopher, described methods of agreement, difference, and concomitant variation, which are fundamental to inductive logic and the scientific method. In the following century, the Persian scientist Abū Rayhān al-Bīrūnī introduced early scientific methods across various fields, including mineralogy and sociology. Al-Biruni's emphasis on repeated experimentation closely resembled the modern scientific method.
During the 16th and 17th centuries, the Scientific Revolution witnessed significant advancements in the scientific method. This period saw the furthering of empiricism by Francis Bacon and Robert Hooke, the rationalist approach of René Descartes, and the prominence of inductivism associated with Isaac Newton.
The work of Newton exemplified the development of the scientific method. His formulation of the laws of gravity and motion was based on empirical observations, inductive reasoning, and mathematical analysis. Newton's work unified previously described phenomena of gravity on Earth with known astronomical behaviours, marking a significant milestone in the understanding of the universe.
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Newton's laws of motion
Isaac Newton is credited with discovering the laws of gravity after seeing an apple fall from a tree in his mother's garden. However, the words often associated with this discovery were not Newton's but those of his scientific rival, Robert Hooke, who penned them in 1670, decades before Newton began telling the story. Newton's law of gravity, or the law of universal gravitation, describes gravity as a force that pulls objects with mass toward each other. The force of gravity is stronger when objects are closer together and weaker when they are far apart.
Newton's second law defines a force to be equal to the change in momentum (mass times velocity) per change in time. This law can be used to determine the new values of velocity and mass if the force is known. The second law also states that an object subjected to an external force will accelerate, and the amount of acceleration is proportional to the size of the force.
Newton's third law states that when two objects interact, they apply forces to each other of equal magnitude and opposite direction. This law gives us the tools to interpret the motion caused by the force. For example, it explains why light objects fall to the Earth faster than the Earth falls toward them.
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The impact on modern physics
A quick Google search reveals that Isaac Newton is credited with formulating the three laws of gravity in his seminal work, the "Philosophiæ Naturalis Principia Mathematica," published in 1687. These three laws not only explained gravity but also laid the foundation for classical mechanics and had a profound impact on the development of modern physics.
Newton's three laws of gravity had a transformative effect on the field of physics, shaping its development over centuries. Firstly, they provided a unified framework to understand the motion of celestial bodies and terrestrial objects under the influence of gravity. This unification of celestial and terrestrial physics was groundbreaking, as it showed that the same physical laws apply across the universe, doing away with the notion that heavenly bodies operate under different principles.
Secondly, Newton's laws facilitated the development of precise mathematical techniques to describe and predict the motion of objects. This led to the emergence of calculus and advanced mathematical physics, with Newton himself making significant contributions to the field. The mathematical rigor introduced by Newton and his contemporaries set a standard for subsequent physical theories, emphasizing the need for precise quantitative predictions.
The laws of gravity also had a profound impact on our understanding of the natural world, offering a mechanistic view of the universe. This view, where objects obeyed mathematical laws without the need for divine intervention, was a significant shift from prevailing philosophical and religious ideas of the time. Newton's laws thus played a crucial role in the scientific revolution, promoting a more secular and empirical approach to understanding the universe.
Moreover, the success of Newtonian gravity in explaining a wide range of phenomena inspired physicists to seek similar unifying theories for other areas of physics. This led to the development of classical mechanics, electromagnetism, and thermodynamics, among other fields, all of which aimed to provide a comprehensive and consistent set of laws to describe the natural world. The search for such unifying theories continues to drive much of modern physics, from particle physics to cosmology.
Finally, while Newton's laws of gravity were incredibly successful, they also had limitations that became apparent in the late 19th and early 20th centuries. The inability of Newtonian gravity to fully explain certain phenomena, such as the anomalous precession of Mercury's orbit, led to the development of Albert Einstein's general theory of relativity. This new theory of gravity, published in 1915, provided a more accurate description of gravity by incorporating it into the geometry of spacetime. Thus, Newton's laws not only shaped classical physics but also indirectly contributed to the development of relativity and our modern understanding of spacetime and gravity.
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