Introduction To Mechanics And Properties Of Matter PdfBy Alionyshka In and pdf 10.04.2021 at 06:35 7 min read
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- Introduction to Mechanics and Symmetry
- Classical mechanics
- Science: An Elementary Teacher’s Guide/Properties of Matter
Introduction to Mechanics and Symmetry
Mechanics , science concerned with the motion of bodies under the action of forces, including the special case in which a body remains at rest. Of first concern in the problem of motion are the forces that bodies exert on one another. This leads to the study of such topics as gravity , electricity, and magnetism, according to the nature of the forces involved.
Given the forces, one can seek the manner in which bodies move under the action of forces; this is the subject matter of mechanics proper. Historically, mechanics was among the first of the exact sciences to be developed. Its internal beauty as a mathematical discipline and its early remarkable success in accounting in quantitative detail for the motions of the Moon, Earth, and other planetary bodies had enormous influence on philosophical thought and provided impetus for the systematic development of science.
Mechanics may be divided into three branches: statics , which deals with forces acting on and in a body at rest; kinematics , which describes the possible motions of a body or system of bodies; and kinetics , which attempts to explain or predict the motion that will occur in a given situation.
Alternatively, mechanics may be divided according to the kind of system studied. The simplest mechanical system is the particle , defined as a body so small that its shape and internal structure are of no consequence in the given problem. More complicated is the motion of a system of two or more particles that exert forces on one another and possibly undergo forces exerted by bodies outside of the system. The principles of mechanics have been applied to three general realms of phenomena.
The motions of such celestial bodies as stars, planets, and satellites can be predicted with great accuracy thousands of years before they occur.
The theory of relativity predicts some deviations from the motion according to classical, or Newtonian, mechanics; however, these are so small as to be observable only with very accurate techniques, except in problems involving all or a large portion of the detectable universe. As the second realm, ordinary objects on Earth down to microscopic size moving at speeds much lower than that of light are properly described by classical mechanics without significant corrections.
The engineer who designs bridges or aircraft may use the Newtonian laws of classical mechanics with confidence, even though the forces may be very complicated, and the calculations lack the beautiful simplicity of celestial mechanics. The third realm of phenomena comprises the behaviour of matter and electromagnetic radiation on the atomic and subatomic scale.
Although there were some limited early successes in describing the behaviour of atoms in terms of classical mechanics, these phenomena are properly treated in quantum mechanics. Classical mechanics deals with the motion of bodies under the influence of forces or with the equilibrium of bodies when all forces are balanced. The subject may be thought of as the elaboration and application of basic postulates first enunciated by Isaac Newton in his Philosophiae Naturalis Principia Mathematica , commonly known as the Principia.
They may be used to predict with great precision a wide variety of phenomena ranging from the motion of individual particles to the interactions of highly complex systems.
A variety of these applications are discussed in this article. In the framework of modern physics , classical mechanics can be understood to be an approximation arising out of the more profound laws of quantum mechanics and the theory of relativity. Moreover, many ideas and results of classical mechanics survive and play an important part in the new physics. The central concepts in classical mechanics are force , mass , and motion.
Neither force nor mass is very clearly defined by Newton, and both have been the subject of much philosophical speculation since Newton. Both of them are best known by their effects. Mass is a measure of the tendency of a body to resist changes in its state of motion. Forces, on the other hand, accelerate bodies, which is to say, they change the state of motion of bodies to which they are applied.
The interplay of these effects is the principal theme of classical mechanics. These three quantities are energy , linear momentum , and angular momentum. Any one of these can be shifted from one body or system of bodies to another. In addition, energy may change form while associated with a single system, appearing as kinetic energy , the energy of motion; potential energy , the energy of position; heat, or internal energy , associated with the random motions of the atoms or molecules composing any real body; or any combination of the three.
Nevertheless, the total energy , momentum, and angular momentum in the universe never changes. This fact is expressed in physics by saying that energy, momentum , and angular momentum are conserved. They had to be discovered later. In fact, in modern physics, force is no longer a central concept, and mass is only one of a number of attributes of matter. Energy, momentum, and angular momentum, however, still firmly hold centre stage. The continuing importance of these ideas inherited from classical mechanics may help to explain why this subject retains such great importance in science today.
Mechanics Article Media Additional Info. Article Contents. Home Science Physics Mechanics physics. Print print Print. Table Of Contents. While every effort has been made to follow citation style rules, there may be some discrepancies.
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Science: An Elementary Teacher’s Guide/Properties of Matter
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Classical [note 1] mechanics is a physical theory describing the motion of macroscopic objects, from projectiles to parts of machinery , and astronomical objects , such as spacecraft , planets , stars , and galaxies. For objects governed by classical mechanics, if the present state is known, it is possible to predict how it will move in the future determinism , and how it has moved in the past reversibility. The earliest development of classical mechanics is often referred to as Newtonian mechanics. It consists of the physical concepts based on foundational works of Sir Isaac Newton , and the mathematical methods invented by Gottfried Wilhelm Leibniz , Joseph-Louis Lagrange , Leonard Euler , and other contemporaries, in the 17th century to describe the motion of bodies under the influence of a system of forces. Later, more abstract methods were developed, leading to the reformulations of classical mechanics known as Lagrangian mechanics and Hamiltonian mechanics.
Matter is anything that has mass and volume, including all atoms and all subatomic particles, but also all mixtures of compounds, all objects we encounter around us, etc. The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more. Some properties of matter are unchanging, such as the density of gold, while other properties depend on the amount of matter present such as the mass of a golf ball compared to the mass of a bowling ball or the properties of the mixture. All atoms of any particular element will share traits of that element, but an element's properties can be changed drastically through chemical reactions.
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Mechanics , science concerned with the motion of bodies under the action of forces, including the special case in which a body remains at rest. Of first concern in the problem of motion are the forces that bodies exert on one another.
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