What is physics and why we study it? Is it harmful for us
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Answer:
A. Physics. Definition
When learning about and discussing physics, we focus heavily on energy, the core element of the science. To better understand this connection, it helps to refer to a solid working definition of physics.
Physics. The science in which matter and energy are studied both separately and in combination with one another.
And a more detailed working definition of physics may be: The science of nature, or that which pertains to natural objects, which deals with the laws and properties of matter and the forces which act upon them. Quite often, physics concentrates upon the forces having an impact upon matter, that is, gravitation, heat, light, magnetism, electricity, and others.
B. Physics. Orientation
Because physics utilizes elements of other branches of sciences, biology and chemistry for example, it has the reputation of being more complicated than other sciences.
Physics, as opposed to natural philosophy (with which it was grouped until the 19th century), relies upon scientific methods in order to describe the natural world.
To understand the fundamental principles of the universe, physics utilizes many workings from the other natural sciences. Because of this overlap, phenomena studied in physics (conservation of energy for example) are common to all material systems. The specific ways in which they apply to energy (hence, physics) are often referred to as the "laws of physics."
Because each of the other natural sciences biology, chemistry, geology, material science, medicine, engineering, and others, work with systems which adhere to the laws of physics, physics is often referred to as the "fundamental science."
For an example of how the laws of physics apply to all of the other sciences, consider that chemistry, the science of matter which studies atoms and molecules, complies with the theories of quantum mechanics, thermodynamics, and electromagnetism in order to produce chemical compounds.
C. Physics and Mathematics
As a whole, physics is closely related to mathematics, for it provides the logical structure in which physical laws may be formulated and their predictions quantified. A great many of physics' definitions, models, and theories are expressed using mathematical symbols and formulas.
The central difference between physics and mathematics is that ultimately physics is concerned with descriptions of the material world whereas mathematics is focused on abstract logical patterns that may extend beyond the real world.
Because physics concentrates on the material world, it tests its theories through the process known as observation or experimentation. In theory, it may seem relatively easier to detect where physics leaves off and mathematics picks up. However, in reality, such a clean-cut distinction does not always exist. Hence, the gray areas in between physics and mathematics tend be called "mathematical physics."
Both engineering and technology also have ties to physics. For instance, electrical engineering studies the practical application of electromagnetism. That is why you will quite often find physics to be a component in the building of bridges, or in the creation of electronic equipment, nuclear weaponry, lasers, barometers, and other valuable measurement devices.
Interested in learning more? Why not take an online class in Physics?
D. Physics. Range of Fields
While there are no definitive answers as to whether or not physics is more complex than other sciences, it is safe to say that physics has decidedly more branches, both traditional and modern.
Take for example the range of traditional subdivisions of physics that exist: acoustics, optics, mechanics, thermodynamics, and electromagnetism. And then there are those still considered to be modern extensions: atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.
Below is a list, by no means comprehensive, of the dizzying variety of disciplines that exist within the science of physics:
Acoustics. Study of sound and sound waves.
Astronomy. Study of space.
Astrophysics. Study of the physical properties of objects in space.
Atomic Physics. Study of atoms, specifically the electron properties of the atom.
Biophysics. Study of physics in living systems.
Chaos. Study of systems with strong sensitivity to initial conditions, so that a slight change at the beginning quickly becomes major changes in the system.
Chemical Physics. Study of physics in chemical systems.
Computational Physics. Application of numerical methods to solve physical problems for which a quantitative theory already exists.
Cosmology. Study of the universe as a whole, including its origins and evolution.
Cryophysics, Cryogenics, and Low Temperature Physics. Study of physical properties in low temperature situations, far below the freezing point of water.