Physics: Most Popular Articles
This overview of the different aspects of quantum physics is intended to provide some perspective to those new to the subject, so that they can further explore the wonders inherent in this miraculous realm.
A brief description of the science of physics.
Physics is the study of the fundamental laws of nature. If you want to know what some of the most important and useful of those laws of physics are, this is where you can find out.
definition of energy. Physics.
Density is a key concept in analyzing how materials interact in fluid mechanics, weather, geology, material sciences, engineering, and other fields of physics.
Kirchhoff's Laws are some of the most fundamental and important rules in electronics. Kirchhoff's Current Law defines how current is distributed in an electronic circuit, while Kirchhoff's Voltage Lawdefines the distribution of voltage.
definition of heat energy. Physics.
There are six kinds of simple machines, with few or none moving parts. Learn about how these 6 machines are used in your daily lives!
definition of matter. Physics.
An introduction to the basic principles of the law of gravity, as developed by Newton and revised over the years. This provides the foundation for any significant work in understanding gravity, including its application to planetary motion.
definition of electromagnetic induction
An explanation of surface tension, along with some basic experiments and tricks that make use of the phenomenon.
A description of the photon theory of light and what it means, as well as how it developed and its bizarre implications
An overview of the various fields of physics.
Definition of Voltage. Physics.
One of the key principles in quantum physics is the idea of quantum entanglement, where multiple objects exist in states that are linked together
An introduction to the laws of thermodynamics and how they are used to solve problems involving heat or thermal energy transfer.
Information on the field of thermodynamics, from the basics of temperature to kinetic theory to the laws of thermodynamics.
When measuring physical quantities, scientists have to keep track of their level of precision. This article will discuss how scientists use significant figures to do just that, and how you can use significant figures without error in your work. It also discusses the role of scientific notation in making large and small numbers manageable.
There are a lot of interesting ideas in physics, especially in modern physics. Matter exists as a state
A basic introduction to Newton's Three Laws of Motion. Each law of motion has important physical and mathematical interpretations needed to analyze most any problem involving the motion of physical objects
Definition of force, how force applies to physics
definition of current. Physics.
Some people wonder if time really exists. I explain what we know about time.
Understand how a transistor functions, and how its design incorporates into an overall electronic circuit.
Definition of velocity. Physics.
definition of entropy. Physics.
definition of temperature. Physics.
The Compton effect, where the energy of a photon decreased upon interaction with matter, is another experiment that demonstrated the particle properties of electromagnetic radiation.
In 1935, Erwin Schrodinger developed a thought experiment which illuminated some of the problems with extending the microscopic concepts of quantum physics into the macroscopic realm. The thought experiment has been used in the years since to highlight the key concepts of quantum physics, ranging from the role of the observer to the meaning of the wave function.
If someone is interested in physics and wants to pursue it in college and as a career, there are a number of fundamental concepts they must become familiar with.
String theory is an emerging theory that attempts to explain physics in term of a multi-dimensional universe, where the dimensions of space and time that we observe is a result of vibrations of microscopic energy strings in other dimensions.
This introduction illuminates the main principles of the scientific method, as well as hypothesis creation and testing procedures that are used in executing the scientific method.
An overview of the four fundamental forces of physics and why they are so fundamental.
Definition of mass. Physics.
An introduction to the laws of thermodynamics and how they are used to solve problems involving heat or thermal energy transfer. Page 3.
The visible light spectrum is the range of electromagnetic radiation that we are most familiar with. Here you can learn even more about it!
We discuss the De Broglie hypothesis, which proposes that all matter exhibits wave-like properties and relates the observed wavelength of matter to its momentum.
An overview of Einstein's Theory of Relativity. Learn about special relativity & general relativity, including the Lorentz transformations that make them possible.
One of the most impressive theories of the 20th century, the Big Bang explains the origins of the universe ... at least up to a point. Find out what the theory actually says, what it does not say, and what it may or may not say.
Definition of acceleration. Physics.
Quantum physics allows for many wondrous things, but perhaps none will have more impact than quantum computing ... if anyone ever builds a quantum computer that works (for more than a few nanoseconds).
In physics, the distinction between the concepts of energy and force can be very subtle, but important. Energy is an absolute measure of the system, whereas the force is specifically related to the set-up of the situation.
An explanation of the second law of thermodynamics, as well as how it relates to the concepts of entropy and energy transfer. Page 4.
An introduction to the laws of thermodynamics and how they are used to solve problems involving heat or thermal energy transfer. Page 5.
A brief outline of the types of fundamental particles which are studied in elementary particle physics.
A description of the photoelectric effect and its significance, which includes crushing the classical wave theory of light, Einstein's first publication, Einstein's only Nobel Prize, and one of the major steps in developing quantum mechanics.
Learn about the manifestation of the Doppler effect from a moving light source and how the observed light exhibits either a red shift or blue shift to the wavelength and frequency.
Dimensional analysis is a process by which you can use the units of certain values to help figure out how to achieve the solution you need. Learn how to use dimensional analysis to help you solve physics problems.
The Michelson-Morley experiment was a series of experiments that attempted to measure the motion of the Earth relative to the ether. Instead, it measured that the Earth did not move at all relative to the ether, indicating that something was wrong with the scientific idea of the ether in the 1800s.
Definition of speed. Physics.
Definition of work. Physics.
It's often said that the theory of relativity prohibits anything from moving faster than the speed of light. Is this really true? Find out what relativity really says about the speed of light.
definition of an adiabatic process
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I'm often asked. Physics.
When measuring physical quantities, scientists have to keep track of their level of precision. This article will discuss how scientists use significant figures to do just that, and how you can use significant figures without error in your work. It also discusses the role of scientific notation in making large and small numbers manageable. Page 2.
An explanation of the zeroeth law of thermodynamics, which is considered by many to be the most fundamental of the thermodynamics laws, making the measurement of temperature possible. Page 2.
Definition of a vector. Physics.
Definition of inertia. Physics.
This introduction to the SI units provides a foundation for the units that are used to quantify the physical qualities of the universe.
definition of viscosity. Physics.
Here you will be introduced to the mathematics necessary for the manipulation of vector quantities, which have both a magnitude and direction. Vectors are used throughout physics, so an understanding of these concepts is important to solve many physics problems.
Why should you study physics? What is the use of a physics education? If you aren't going to become a physicist, you may have questions such as these ... but there are good reasons for everyone to study physics.
Definition of power. Physics.
How to determine the pressure inside a bubble, whether it be a gas-filled soap bubble or a liquid drop. Page 2.
We explore wave particle duality: the particle properties of waves and the wave particles of particles. What do these strange properties mean? How can we use them to understand physics?
Einstein's Theory of General Relativity expands on the initial concepts of relativity to create a geometric framework of spacetime which can be used to explain gravity, something which even Newton couldn't explain. Learn about the concepts of general relativity. Page 4.
Definition of potential energy. Physics.
a subatomic particle contained in the atomic nucleus. It has no net electric charge, unlike the proton's positive electric charge.
Definition of torque. Physics.
Definition of impulse. Physics.
Learn about Young's Double Slit experiment, where interference patterns seem to prove the wave theory of light. But there's way more to this simple experiment than meets the eye. We'll explain the original experiment and its quantum mechanical permutations.
Information on formulating a scientific hypothesis. Here you will also find discussions of models, theories, and laws, as well as the differences between them.
Kinetic energy is the energy of motion, a concept which is used widely in physics to solve problems involving changes in motion.
Gravitational fields are a method of expressing gravity in terms that make it easy to apply in specific cases. Learn about how gravitational fields, and the equations related to them, are used to solve problems. Page 2.
definition of absolute zero. Physics.
There are a lot of woo-woo metaphysical arguments which make bold claims, trying to bolster their spiritual claims by applying concepts from quantum physics in ways that are not fully justified. One of the more intriguing arguments is about whether or not the
Definition of the EPR Paradox. Physics.
How does heat transfer? What methods are most or least efficient? What are the effects of heat transfer?
Bell's Theorem is the theorem in quantum physics which helped solidify the idea that the interactions in quantum physics between entangled particles are instantaneous and non-local in nature.
It has long been a dream of science (or, at least, science fiction) to create machines that could fly and levitate. This can be done with magnets, of course, but takes a great deal of energy. In recent years, the new phenomenon of quantum levitation has given some possible hope that levitation may be more practical than previously believed.
What is a thermodynamic process? How can it be used to analyze the energy within a system? These and more questions are answered here.
We explain Huygens' Principle of wave diffraction, which is applied in many experiments with sound and light.
Physicist and cosmologist Stephen Hawking is one of the most popular and respected modern physicists, a bestselling author and a popular Simpsons guest.
Does the Ice Diet work? Find out the reasons why the ice diet, which is based on calories burned by warming water, doesn't actually work the way so many think it should.
definition of perfectly inelastic collision
Is there a relationship between the mysterious phenomenon of human consciousness and the mysterious phenomenon of quantum physics?
Physics experiments utilizing surface tension. Page 4.
Definition of moment of inertia. Physics.
Stars don't last forever. Why do stars burn? What happens when a star dies? How does its collapse manifest?
Definition of a proton. Physics.
Learn how to create a great mad scientist costume.
Learn about Lorentz transformations and how they are applied to special relativity to produce intriguing results with regards to length contraction, relativistic mass & energy, and even time dilations. Page 3.
definition of an isothermal process
A list of the fundamental physical constants used in physics problems.
Quantum gravity, or unified field theory, is an attempt to unify Einstein's theory of general relativity with quantum physics.
Information about the physicist Niels Bohr, who was key in the development of quantum physics. Bohr devised the simplified Bohr model of the hydrogen atom. He was central to the development of the Copenhagen interpretation of quantum physics.
Definition of momentum. Physics.
Read about the definition of quark as well as the meaning of an antiquark and their importance in the world of physics.
A list of films which prominently feature physics or physicists, generally in an inspiring (and entertaining) way.
definition of a superconductor. Physics.
A description of the physical principle behind Doppler radar.
Learn the necessary equations and relationship to analyze one-dimensional motion, such as a car driving on a flat road or a free-falling body, especially in the case of a constant acceleration
A lever is a rigid beam pivoting around a fulcrum. After discovering the physics at work, Archimedes said he could move the earth with it. Find out how.
Find out the density of common substances.
A black hole is a curvature of spacetime geometry due to an intense gravitational field. The effects of a black hole are so extreme that even light cannot escape it, thus the name.
Definition of the Bose-Einstein condensate.
Definition of Steady State Theory
Definition of plasma. Physics.
Learn the definition of unified field theory, or grand unified theory--a term coined by Albert Einstein. Learn this and other physics terms.
Learn about the twin paradox, a famous thought experiment in physics (and science fiction) which demonstrates one of the only ways for time travel
Formulas commonly used for calculating the moment of inertia for different objects.
Thoughts Can Actively Create Things: This is the premise of the book, called the "Law of Attraction,"
definition of sublimation. Physics.
definition of an isobaric process
Heisenberg's uncertainty principle is one of the cornerstones of quantum physics, but it is often not deeply understood by those who have not carefully studied it.
An overview of general information about physicist Richard P. Feynman.
If the laws of thermodynamics are considered at their most fundamental level, what sort of consciousness would be most likely to exist? The curious result is a bizarre concept called a Boltzmann brain.
One of the most intriguing concepts in physics is the many worlds interpretation of quantum physics, which proposes that each possible outcome for any event takes place in an ever-branching series of realities.
Galileo Galilei is considered by many to be the father of experimental science. His work laid the foundation for modern physics by defining physical properties in coherent mathematical terms, and establishing principles which Newton would later use to create a coherent theoretical framework for classical physics.
Research in blackbody radiation created a major dilemma for classical physics. The problem was resolved by Max Planck in 1900 by introducing the concepts which laid the foundation for all of quantum mechanics.
The equations necessary to analyze motion in a two-dimensional plane.
A brief overview of Albert Einstein's life and work, as well as other information surrounding the popular scientific figure.
The principle of superposition governs how waves interact, resulting in interference and diffraction. Learn about constructive and destructive interference, as well as manifestations of interference and diffraction.
A description of the photoelectric effect and its significance, including an explanation on how it catapulted Einstein into prominence. Page 2.
definition of a laser. Physics.
definition of spacetime. Physics.
Theoretical physicist David Deutsch explores how science understands things and progresses by providing better explanations.
Gravitational potential energy is a useful concept in determining the end result of motion within a gravitational field. Page 3.
Against the surface of a vertical tube, Capillarity is an effect when liquid in a narrow vertical tube becomes elevated or depressed as a result of the surface tension and pressures involved. Page 3.
definition of electron - electron as a fundamental physics particle
A cathode ray is a beam of electrons that travel from the negatively charged to positively charged end of a vacuum tube, across a voltage difference.
Loop quantum gravity explains the universe in terms of tangles in spacetime.
definition of an isochoric process
A description of the physics of dry ice and how it is used to create smoke and fog.
Hawking radiation is an explanation of how radiation can be emitted from a black hole, despite its attractive power, due to quantum effects.
An explanation of momentum, how it is used and relates to the Second Law of Motion.
Definition of oscillation. Physics.
definition of a wormhole. Physics.
Definition of nuclear fission. Physics.
Profile of the field of electronics
The electromagnetic spectrum of light spans from radio waves to gamma rays, including that band of colors that we're most familiar with: visible light.
Definition of dark matter. Physics.
A pie chart representing the different types of material that make up the universe. Page 7.
definition of a Higgs Boson. Physics.
The values of surface tension for various liquids, as determined by experimental research in the laboratory. Page 5.
A list of popular physics myths.
Sir Isaac Newton is one of the most significant physicists in western history. Considered the founder of classical physics, he took the disparate concepts that existed at his time and brought them together into a cohesive field of study.
definition of the holographic principle