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Physics
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Science
Physics
: Electricity, Electromagnetism, History, Light, Machines, Magnetism, Mechanics, Nuclear, Optics, Quantum, Relativity, Thermodynamics, Waves • Books, Toys
Physics (Greek phusis, fysis: nature) is the science of Nature in
the broadest sense. Physicists study the behaviour and interactions
of matter and energy, which are referred to as physical phenomena.
Physics is the study of matter, energy, motion, and forces.
Physics is a major branch of science, concerned with the fundamental
components of the universe, the forces they exert on one another,
and the results produced by these forces.
We learn almost all of what we know about the world around us from the
interaction of the objects in the world with electromagnetic radiation.
Often, the word 'light' is used a little more broadly, to include
electromagnetic radiation that is just outside the range we can see,
in the ultraviolet and infrared.
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In physics, a simple machine is any device that only requires the
application of a single force to work. It is a tool used to make work
easier. Machines use a force (push or pull) to move a load.
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Magnets attract some metals, such as iron, nickel, cobalt, and some
alloys. You can magnetise a piece of one of these metals by stroking
it with a magnet.
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This document is a short introduction to basic concepts and definitions
in classical physics. It assumes no mathematics beyond elementary
algebra and geometry.
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One of the main quests of science throughout the ages has been to
discover what matter is made of - and what holds it together.
All matter is made out of many tiny particles called atoms.
The study of how these atoms interact is called Chemistry.
Modern physics has discovered how atoms are made up of smaller
particles and how these particles interact to build atoms into
molecules and larger objects of matter.
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The concept of mechanical waves leads to the concept of light,
which is also a wave phenomenon. However, its nature is somewhat more
devious than sound waves and other mechanical waves, and in fact has
some maddeningly contradictory aspects that eventually broke through
the boundaries of classical physics. This chapter provides a short
description of light and optical technologies.
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Albert Einstein's Theory of Relativity is a set of two theories in
physics, special relativity and general relativity. The core idea of
both theories is that two observers who move relative to each other
will often measure different 'time' and 'space' intervals for the same
events, but the content of physical law will be the same for both.
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One of the simplest, and most difficult to grasp, concepts in elementary
physics is that of "heat", and that is the starting point for the study
of "thermal physics" or "thermophysics". Thermal physics is a particular
interesting aspect of physics as it underlies the operation of engines
and refrigeration systems. This chapter provides an introduction to
thermal physics, engines, and refrigeration systems.
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One of the properties of matter is that is can support transfers of
mechanical energy, whether the matter is solid, liquid, or gas, without
any net movement of the molecules involved. Such transfers are referred
to as "wave motion", or a transitory displacement of atoms within the
matter that passes on kinetic energy.
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Science (from scientia, Latin for "knowledge") has come to mean a body
of knowledge, or a method of study devoted to developing this body of
knowledge, concerning the universe gained through repeated observation
and experimentation (scientific method). Exactly what
constitutes science and scientific methods are subjects studied by the
philosophy of science. Science is the systematic study of the
properties of the physical world, by means of repeatable experiments
and measurements, and the development of objective theories describing
these activities, and predicting verifiable features that could be also
tested by experiment. Statements in science must be precise and
meaningful, such that they can be tested by experiments or observations
by other people, with the same results. Some of the major branches of
science are astronomy, biology, chemistry, and physics
Sciences are typically very dependant on mathematics.
About Physics
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