De Motu ^[1](on Motion) is an essay written by George Berkeley and published in 1721. Its full title is De Motu or The Principle and Nature of Motion and the Cause of the Communication of Motions. The essay was unsuccessfully submitted for a prize that had been offered by the Royal Academy of Sciences at Paris. Bishop George Berkeley George Berkeley (British English://; Irish English: //) (12 March 1685 – 14 January 1753), also known as Bishop Berkeley, was an influential Irish philosopher whose primary philosophical achievement is the advancement of what has come to be called subjective idealism, summed up in his dictum, Esse est percipi (To... // Events Pope Innocent XIII becomes pope Johann Sebastian Bach composes the Brandenburg Concertos April 4 - Robert Walpole becomes the first prime minister of Britain September 10 - Treaty of Nystad is signed, bringing an end to the Great Northern War November 2 - Peter I is proclaimed Emperor of All the Russias...   City flag City coat of arms Motto: Fluctuat nec mergitur (Latin: Tossed by the waves, she does not sink) Coordinates Time Zone CET (GMT +1) Administration Country France Région ÃŽle-de-France Département Paris (75) Subdivisions 20 arrondissements Mayor Bertrand Delanoë  (PS) (since 2001) City Statistics Land area...

Berkeley rejected Sir Isaac Newton's absolute space, time, and motion. With this essay, Berkeley is considered to be the "precursor of Mach and Einstein." ^[2] Sir Isaac Newton in Knellers portrait of 1689. ... Look up absolute in Wiktionary, the free dictionary. ... Space has been an interest for philosophers and scientists for much of human history. ... Two distinct views exist on the meaning of time. ... In physics, motion means a change in the position of a body with respect to time, as measured by a particular observer in a particular frame of reference. ... Mach may refer to: Ernst Mach Mach number, as a measure of speed inertial mass GNU Mach The microkernel on which GNU Hurd is based Mach kernel, an operating systems kernel technology used in Mac OS X Mach band, an optical illusion Mach Five, the name of the car in... Einstein redirects here. ...

Concrete and Abstract Motion

We must pay attention to facts regarding things and their nature, not to words or to someone's authority. The mind should be concerned with particular and concrete things themselves, not with abstract terms. The effects that are felt on our senses should be noticed. The causes of these effects are rationally inferred and are occult qualities. Concrete is a construction material that consists, in its most common form, of Portland cement, construction aggregate (generally gravel and sand) and water. ... Look up abstract, abstraction in Wiktionary, the free dictionary. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Gravity and force are examples of occult qualities. But they can be useful terms. Gravity can designate concrete bodies in motion and force can designate the concrete effort of resisting. However, they should not be used abstractly, separate from concrete, individual things. If no change occurs and there is no effect, then there is no force. Force, gravity, and attraction are mathematical, hypothetical abstractions and they are not found in nature as physical qualities. The parallelogram of composite forces is not a physical quality. It is mathematical. Attempts to explain the cause and origin of motion are abstract and obscure. They are not particular and determinate assertions. Such attempts try to explain the unknown by something that is even more unknown. Gravity is a force of attraction that acts between bodies that have mass. ... In physics, force is an influence that may cause a body to accelerate. ... In general, Attraction is a force, that moves one object to another. ... Mathematics is commonly defined as the study of patterns of structure, change, and space; more informally, one might say it is the study of figures and numbers. Mathematical knowledge is constantly growing, through research and application, but mathematics itself is not usually considered a natural science. ... A parallelogram. ...

Principles or Causes of Motion

Bodies are not known to contain, within themselves, forces that cause motion. Minds, however, are known to cause motion. Such minds are particular, individual causes that are parts of the primary, universal cause of motion. To meet Wikipedias quality standards, this article may require cleanup. ...

Bodies are passive, not active. They merely persist indifferently in their states, whether of impelled motion or of rest. Action and reaction are only mathematical hypotheses, not physical qualities. It is useful to refer to action and reaction when demonstrating mechanics, but they are not causes of motion. ACTION bus at the interchange in Civic. ... A reaction is the following: In physics, a reaction (physics) is defined by Newtons third law: For every action there is an equal and opposite reaction. The idea that any given force has a pair or opposite force. ...

We personally experience within ourselves a cause of our bodily motion. It is called soul, mind, or spirit. But, we do not experience a cause of motions inside of other bodies. The ultimate cause of the motion of all bodies is the mind of God. This is known through metaphysics and theology. The soul, according to many religious and philosophical traditions, is a self-aware ethereal substance particular to a unique living being. ... The English word spirit comes from the Latin spiritus, meaning breath. ... This article discusses the term God in the context of monotheism and henotheism. ... Plato and Aristotle, by Raphael (Stanza della Segnatura, Rome). ... Theology (Greek θεος, theos, God, + λογος, logos, word or reason) means reasoned discourse concerning religion, spirituality and God. ...

Natural science is limited to experiments and mechanics, but it assumes that God was the prime source of motion. The laws of motion, not the cause of motion, are established by natural science. Physicists explain and understand phenomena by showing how they agree with the laws of motion. Fictional, abstract, general terms such as force, action, and reaction are used in theories, formulas, and computations. These cannot be found in bodies.^[3] In the scientific method, an experiment (Latin: ex-+-periri, of (or from) trying), is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena. ... Mechanics (Greek ) is the branch of physics concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effect of the bodies on their environment. ...

Through our senses, we actually experience only the effects of moving or resting bodies. The natural scientist is concerned with experiments, laws of motion, mechanical principles, and rational deduction from those principles. The principle and cause of motion itself is a metaphysical, theological, and moral concern. A moral is a one sentence remark made at the end of many childrens stories that expresses the intended meaning, or the moral message, of the tale. ...

Nature of Motion

Motion should not be considered as an abstraction, separated from space and time. It should not be analyzed into abstract ideas such as movement, velocity, and force. Mathematical considerations of spatial and temporal infinitesimals lead to paradoxes. Motion should not be equated with the cause of motion. To say that the quantity of motion is always conserved is to confuse motion itself with the force that causes motion. The force of the cause of motion is conserved. Motion is not an internal, living force in things. It is a lifeless, indifferent effect. Space has been an interest for philosophers and scientists for much of human history. ... Two distinct views exist on the meaning of time. ... Look up movement in Wiktionary, the free dictionary The term Movement has a variety of different meanings related to motion: Physical movement between points in space (A to B). The amount of movement is called distance. ... The velocity of an object is simply its speed in a particular direction. ... In mathematics, an infinitesimal, or infinitely small number, is a number that is smaller in absolute value than any positive real number. ... Robert Boyles self-flowing flask fills itself in this diagram, but perpetual motion machines cannot exist. ...

Motion in space

Absolute space contains no bodies. But, as such, it would not be observable. Nothing is denoted by the words "absolute space." Motion and space are relative. They presuppose a relationship to some other body through which they are determined. For a wider view, it would be useful to consider motion relative to the fixed stars, which would be considered as being at rest, instead of to absolute space. Just as we cannot know absolute space, we cannot know whether the whole universe is at rest or is moving uniformly in a direction. Kinship is a biological and/or familial relationship between two organisms. ... A fixed star is a celestial object that does not seem to move (in comparison to the other stars of the night sky). ...

To determine the true nature of motion, we must follow three rules: (1) distinguish mathematical hypotheses from the nature of things; (2) beware of abstractions; (3) consider motion as sensible or imaginable and be content with relative measures.

Communication of Motion

Physical science is concerned only with mechanics. Therefore, it can be said that, in a collision, action and reaction are always opposite and equal. Such actions and forces, though, are only mathematical hypotheses. We only really know that the striking body loses motion and the struck body gains motion. We do not know if the motion is communicated from one body to another or if the motion is destroyed in the striker and is created in the struck. In the true nature of things, all bodies are passive. The truly active cause of motion is metaphysical and not the concern of physical science.

References

1. ^ Berkeley's Philosophical Writings, New York: Collier, 1974, Library of Congress Catalog Card Number: 64-22680
2. ^ The New Encyclopedia Britannica, Micropædia, Vol. 2, Chicago, 2007
3. ^ Encyclopedia of Philosophy, Vol. I, "George Berkeley", New York: Macmillan, 1972

See also

• George Berkeley
• Mach's principle