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What Is Physics All About

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The Role Of Physics In Other Fields Of Science

All physics explained in 15 minutes (worth remembering)

In a broader sense, physics can be seen as the most fundamental of the natural sciences. Chemistry, for example, can be viewed as a complex application of physics, as it focuses on the interaction of energy and matter in chemical systems. We also know that biology is, at its heart, an application of chemical properties in living things, which means that it is also, ultimately, ruled by the physical laws.

Of course, we don’t think of these other fields as part of physics. When we investigate something scientifically, we look for patterns at the scale that is most appropriate. Though every living thing is acting in a way that is fundamentally driven by the particles of which it is composed, trying to explain an entire ecosystem in terms of the behavior of fundamental particles would be diving into an unhelpful level of detail. Even when looking at the behavior of a liquid, we look in general at the properties of the fluid as a whole through fluid dynamics, rather than paying particular attention to the behavior of the individual particles.

Ancient Greek Natural Philosophy

Before physics would become the hard science with all its subdisciplines and subtleties, underpinned by math and underpinning virtually every other science, it would become a way of thinking about the world through natural means. This natural philosophy was of great use to the protoscience. No longer were phenomena considered part of the work of magic or supernatural means. Put simply, natural philosophy determined that every event, no matter the size or significance, must have a natural explanation. This was an important and fundamental shift away from a mystical or supernatural view of the world although it was not based on experimentation or observation as the later science of physics would become. These early thinkers were Thales who created natural philosophy and theorized that seismological events such as earthquakes had a natural cause but assumed that landmasses were giant rafts that reacted to ocean ripples which caused the quakes.

What Is Modern Physics

Modern physics is a branch of physics which deals with the post-Newtonian concepts in the world of physics. It is based on the two major breakthroughs of the twentieth century: Relativity and Quantum Mechanics.

Modern physics often involves an advance description of nature through new theories which were different from the classical descriptions and involves elements of quantum mechanics and Einsteinian relativity. For instance, quantum effects typically involve distances related to atoms. On the other hand, relativistic effects typically involve velocities compared to the speed of light.

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How Physics Applies To Environmental Science

No other science can get away from physics because all matter is made up of molecules. As physics is the study of how matter acts and reacts to various forcings and aspects of the world and the universe, physics has massive implications for the environmental sciences.

Climate change: Although few physicists deliberately aim to become climatologists, many today are working on some of the fundamental problems caused by our changing climate and examining potential solutions . The physics of our environment, atmosphere and ocean cycle system temperature rises all dictate a number of things such as the fluid movements of water systems such as oceanic oscillations, and how environments will react to atmospheric chemistry changes. Physics will show how climates will change and the long-term effects on both land and aquatic ecologies.

Renewable energy: The contribution of physics to the environmental sciences is no better demonstrated than in the development of renewable energy. For example, solar panels and solar arrays convert light and heat into electricity through chemical processes that we have identified through physics . Also, physics has been fundamental in developing turbines – the science behind wind farms that also generate electricity. Finally, physics can be used to calculate the amount of energy produced by the processing and burning of biofuel just as it has for fossil fuels.

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Models Theories And Laws

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Models, theories, and laws are used to help scientists analyze the data they have already collected. However, often after a model, theory, or law has been developed, it points scientists toward new discoveries they would not otherwise have made.

The models, theories, and laws we devise sometimes imply the existence of objects or phenomena as yet unobserved. These predictions are remarkable triumphs and tributes to the power of science. It is the underlying order in the universe that enables scientists to make such spectacular predictions. However, if experiment does not verify our predictions, then the theory or law is wrong, no matter how elegant or convenient it is. Laws can never be known with absolute certainty because it is impossible to perform every imaginable experiment in order to confirm a law in every possible scenario. Physicists operate under the assumption that all scientific laws and theories are valid until a counterexample is observed. If a good-quality, verifiable experiment contradicts a well-established law, then the law must be modified or overthrown completely.

The study of science in general and physics in particular is an adventure much like the exploration of uncharted ocean. Discoveries are made models, theories, and laws are formulated and the beauty of the physical universe is made more sublime for the insights gained.

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What Is Physics At Ntnu

Physics is a natural science based on experiments, measurements and mathematical analysis with the purpose of finding quantitative physical laws for everything from the nanoworld of the microcosmos to the planets, solar systems and galaxies that occupy the macrocosmos.

The laws of nature can be used to predict the behaviour of the world and all kinds of machinery. Many of the everyday technological inventions that we now take for granted resulted from discoveries in physics. The basic laws in physics are universal, but physics in our time is such a vast field that many subfields are almost regarded as separate sciences.

The early Greeks established the first quantitative physical laws, such as Archimedes’ descriptions of the principle of levers and the buoyancy of bodies in water. But they did not actually conduct experiments, and physics as science stagnated for many centuries. By the 17th century, however, Galileo Galilei and later Issac Newton helped pioneer the use of mathematics as a fundamental tool in physics, which led to advances in describing the motion of heavenly bodies, the laws of gravity and the three laws of motion.

The laws of electricity, magnetism and electromechanical waves were developed in the 1800s by Faraday and Maxwell, in particular, while many others contributed to our understanding of optics and thermodynamics.

Energy Needs Vs Cleaner Greener Technologies

A growing population requires more energy needs, but the needs of climate change mitigation mean we must do everything we can to reduce our energy consumption. There may seem to be a conflict, and there is to a certain degree, but advances are already being made through applied physics. Batteries, power cells and other energy storage methods are able to store more power than ever before, while our electronic devices get more powerful every day will reducing power consumption. In future, we expect new advances in physics and chemistry to reduce energy consumption further still – from LEDs that emit powerful lights at much lower consumption, but also more efficient solar paneling and electrical vehicles. Physics has helped meteorology and climatology to develop wind turbines, solar physics to develop solar arrays and paneling, and harnessed water physics to develop tidal power, hydroelectricity and other water-based technologies that harness energy from the movement of fluid. It has also developed nuclear power what new technologies lie for the remainder of the 21st century will only build on our growing energy needs for a growing population.

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Why Is Gravity So Weird

No force is more familiar than gravity its what keeps our feet on the ground, after all. And Einsteins theory of general relativity gives a mathematical formulation for gravity, describing it as a warping of space. But gravity is a trillion trillion trillion times weaker than the other three known forces .

One possibility speculative at this point is that in addition to the three dimensions of space that we notice every day, there are hidden extra dimensions, perhaps curled up in a way that makes them impossible to detect. If these extra dimensions exist and if gravity is able to leak into them it could explain why gravity seems so weak to us.

It could be that gravity is as strong as these other forces but that it gets rapidly diluted by spilling out into these other invisible dimensions, says Whiteson. Some physicists hoped that experiments at the LHC would give a hint of these extra dimensions but so far, no luck.

A Comprehensive List Of All The Physics Formulas

Physics Definition

Learning physics is all about applying concepts to solve problems. This article provides a comprehensive physics formulas list, that will act as a ready reference, when you are solving physics problems. You can even use this list, for a quick revision before an exam.

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    Learning physics is all about applying concepts to solve problems. This article provides a comprehensive physics formulas list, that will act as a ready reference, when you are solving physics problems. You can even use this list, for a quick revision before an exam.

    Physics is the most fundamental of all sciences. It is also one of the toughest sciences to master. Learning physics is basically studying the fundamental laws that govern our universe. I would say that there is a lot more to ascertain than just remember and mug up the physics formulas. Try to understand what a formula says and means, and what physical relation it expounds. If you understand the physical concepts underlying those formulas, deriving them or remembering them is easy. This ScienceStruck article lists some physics formulas that you would need in solving basic physics problems.

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    Quantum Mechanics Atomic Physics And Molecular Physics

    Quantum mechanics is the branch of physics treating atomic and subatomic systems and their interaction based on the observation that all forms of energy are released in discrete units or bundles called “quanta“. Remarkably, quantum theory typically permits only probable or statistical calculation of the observed features of subatomic particles, understood in terms of wave functions. The Schr√∂dinger equation plays the role in quantum mechanics that Newton’s laws and conservation of energy serve in classical mechanicsi.e., it predicts the future behavior of a dynamic systemand is a wave equation that is used to solve for wavefunctions.

    For example, the light, or electromagnetic radiation emitted or absorbed by an atom has only certain frequencies , as can be seen from the line spectrum associated with the chemical element represented by that atom. The quantum theory shows that those frequencies correspond to definite energies of the light quanta, or , and result from the fact that the electrons of the atom can have only certain allowed energy values, or levels when an electron changes from one allowed level to another, a quantum of energy is emitted or absorbed whose frequency is directly proportional to the energy difference between the two levels. The further confirmed the quantization of light.

    String Theory

    How Do I Know If Physics Is Right For Me

    Are you the kind of person who is curious about how mechanical or electrical devices work? Are you good at mathematics or with computers? Are you eager to discover new concepts and see how they can be applied to real world problems? If so, there’s a good chance that physics will challenge and excite you. And with new efforts underway to develop biophysics and astronomy tracks as part of our physics curriculum, there’s a good chance our program is right for you, too.

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    Why Does Time Seem To Flow Only In One Direction

    Since Einstein, physicists have thought of space and time as forming a four-dimensional structure known as spacetime. But space differs from time in some very fundamental ways. In space, were free to move about as we wish. When it comes to time, were stuck. We grow older, not younger. And we remember the past, but not the future. Time, unlike space, seems to have a preferred direction physicists call it the arrow of time.

    Some physicists suspect that the second law of thermodynamics provides a clue. It states that the entropy of a physical system rises over time, and physicists think this increase is what gives time its direction.

    Entropy may be rising now because it was lower earlier, but why was it low to begin with? Was the entropy of the universe unusually low 14 billion years ago, when the Big Bang brought it into existence?

    For some physicists, including Caltechs Sean Carroll, thats the missing piece of the puzzle. If you can tell me why the early universe had a low entropy, then I can explain the rest of it, he says. In Whitesons view, entropy isn’t the whole story. To me, he says, the deepest part of the question is, why is time so different from space?

    Physics As A Discipline

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    Physics is a dynamic and exciting subject, which combines intellectual fascination with practical relevance to a wide range of human endeavour, from Philosophy and Theology to Medicine and the Biological Sciences to Engineering and the Earth Sciences. The attributes needed by a good physicist include spatial and conceptual vision, mathematical fluency, curiosity and imagination.

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    The Methodology Of Physics

    Physics has evolved and continues to evolve without any single strategy. Essentially an experimental science, refined measurements can reveal unexpected behaviour. On the other hand, mathematical extrapolation of existing theories into new theoretical areas, critical reexamination of apparently obvious but untested assumptions, argument by symmetry or analogy, aesthetic judgment, pure accident, and huncheach of these plays a role . Thus, for example, the quantumhypothesis proposed by the German physicist Max Planck was based on observed departures of the character of blackbody radiation from that predicted by classical electromagnetism. The English physicist P.A.M. Dirac predicted the existence of the positron in making a relativistic extension of the quantum theory of the electron. The elusiveneutrino, without mass or charge, was hypothesized by the German physicist Wolfgang Pauli as an alternative to abandoning the conservation laws in the beta-decay process. Maxwell conjectured that if changing magnetic fields create electric fields , then changing electric fields might create magnetic fields, leading him to the electromagnetic theory of light. Albert Einsteins special theory of relativity was based on a critical reexamination of the meaning of simultaneity, while his general theory of relativity rests on the equivalence of inertial and gravitational mass.

    Kinetic Theory Of Gases

    Based on the primary assumptions that the volume of atoms or molecules is negligible, compared to the container volume and the attractive forces between molecules are negligible, the kinetic theory describes the properties of ideal gases. Here are the most important physics formulas related to the kinetic theory of monatomic gases.

    Pressure = 1/3

    Here, P is pressure, N is the number of molecules and v2 is the mean squared particle velocity.

    Internal Energy = 3/2

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    Definition Of Physics By Microsoft Encarta

    A major science dealing with the fundamental constituents of the universe, the forces they exert on one another, and the results produced by these forces. Sometimes in modern physics a more sophisticated approach is taken that incorporates elements of the three areas listed above it relates to the laws of symmetry and conservation, such as those pertaining to energy, momentum, charge, and parity.

    What these definitions indicate is that physics is a branch of science that deals with the properties of matter and energy and the relationship between them. It also tries to explain the material world and the natural phenomena of the universe.

    The scope of physics is very wide and vast. It deals with not only the tinniest particles of atoms, but also natural phenomenon like the galaxy, the milky way, solar and lunar eclipses, and more. While it is true that physics is a branch of science, there are many sub-branches within the field of physics. In this article, we will explore each of them in depth.

    Influence Of Physics On Related Disciplines

    What is Physics?

    Because physics elucidates the simplest fundamental questions in nature on which there can be a consensus, it is hardly surprising that it has had a profound impact on other fields of science, on philosophy, on the worldview of the developed world, and, of course, on technology.

    Indeed, whenever a branch of physics has reached such a degree of maturity that its basic elements are comprehended in general principles, it has moved from basic to applied physics and thence to technology. Thus almost all current activity in classical physics consists of applied physics, and its contents form the core of many branches of engineering. Discoveries in modern physics are converted with increasing rapidity into technical innovations and analytical tools for associated disciplines. There are, for example, such nascent fields as nuclear and biomedical engineering, quantum chemistry and quantum optics, and radio, X-ray, and gamma-ray astronomy, as well as such analytic tools as radioisotopes, spectroscopy, and lasers, which all stem directly from basic physics.

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