Many of us enjoy looking at optical illusions, but why do our eyes lie to us?????
Although each illusion has it's own reason, and scientists still don't know all the reasons, it comes down to one thing. Our brain makes assumptions.
Our brain uses context of our surroundings to make split second assumptions. This is helpful in everyday life and back when we were hunters and gatherers and needed to make split second decisions in the wild. Our eyes don't show us what's really there just what
In physics you learn about waves.
However, many people don't realize that waves are every where.
A rubens tube is a tube with natural gas pumped through it with holes in the top.
when a steady vibration is used on the tube, a standing wave is formed. It has nodes and anti nodes like any wave.
When you put a lot of vibrations through, like say music, the effect is very cool.
Most rubens tubes are just a linear single tube, in this video however, it goes into 2 dimensions
Many cultures and spiritual factions speak of the importance of frequencies and vibrations. many cultures believe it plays an important role in nature.
Certain frequencies create geometric shapes
as the frequency increases, the patterns get more complex.
A fluid that flows past a surface of a body exerts a force on it. Lift is the perpendicular component to the oncoming flow, of this force. It is the opposite of a drag force.
Aerodynamic lift is different from other kinds of lift. Aerodynamic lift requires relative motion of the fluid. It usually refers to when an object is completely immersed in a fluid.
Lift is what makes it possible for a plane to fly. Lift is also used in Frisbees. As man takes to the sky, we owe much to the power of l
When people think of the light bulb, they just think of Edison. That is not the case.
in 1802, Humphry Davy created the first electric light. He heated carbon with a battery until it started to glow. This was known as the electric arc lamp. This invention didn't work because it didn't last very long and was just too bright for an practical uses.
In 1840, Warren de la Rue enclosed a coiled platinum filament in a vacuum tube and passed an electric current through it. The design was based on
Plasma is one of the four states of matter. You have plasma in your light bulbs, TV's, and the sun. Plasma is created by ionization. A gas is heated or put in a magnetic field. Plasma is a good conductor and therefore has a very small electric field.
Plasma is the most common state of matter in the universe. It is a very important pat in the fusion of light atoms. Plasma is often confined to a small region for fusion to take place in reactors. Plasma is a key part of solving the energy crisis
Continuing, another important part of the game is the weaponry.
To start, there is a weopan class called fusion rifles. The game offers no insight into how these guns work but the only assumption I can draw is that it has something to do with fusion. My theory is that there is some sort of nuclear energy generated by fusion and is somehow controlled and then fired from the wopen. There would be a lot of physics in the charging/splitting of atoms all in a short a series of short bursts.
Destiny is a video game devolved by the company Bungie. Bungie has experience with theoretical physics after they made the Halo series. Destiny is one of the most expensive games ever made, which brings up an important question. Did they do a good job?
The first thing to look at is the little details. The capes the shadows, the lighting, and so on. In this, in my opinion, they did a good job. The game looks and feels fantastic. There are many flaws with this game, but all in all, they did a g
A golf swing is much like a slap shot in hockey. A good golf swing is vital in the game of golf.
A golf swing is almost all rotational energy. A higher velocity means more rotational energy. The more energy in your swing leads to more energy transferred to the golf ball. The more energy you can transfer to ball the farther it will go.
The angle at which the club hits the ball is also important. You want the face of the club to be completely flat when it comes into contact with the ball. If
Hockey is a fast paced sport full of physics. A prime example is the slap shot.
The slap shot is basically a large rotational force. The player is rotating his body and uses the stick as essentially an extension of his body. You can calculate the force by finding the impulse on the puck.
This is a video of Zedeno Chara at the 2012 all star competition
By simple physics equations, we can find out that his stick is rotation at 12.4 radians p
Acoustic guitars work a lot like electric guitars and basses(see previous blog posts). They have six strings. The note the string plays depends on the frequency. The frequency depends on the length, mass and tension of the string. So that means that you'll have to tune and string your guitar differently depending on what strings you use.
When you play a note, the strings vibrate and produce a sound. The note produced depends on the frequency. This is pretty much universal in all string instru
People have heard electric basses for a very long time. People know you plug the bass into the amp and it makes sound. But people don't really know why.... until now.
First, if you take a look at a bass, look in between the bottom of the neck and the bridge. you will see the pickups there. these pickups are actually magnets. These magnets have a north and south pole. these magnets have a wire coiled around them. If you move a conductive material through a static field, then the material, the
The bass guitar, or at least the physics behind it, works very similarly to a guitar.
The note that is produced by plucking the string has to do with the frequency. For example, if a string has a frequency of 440 Hz, than that would be an A note. You can change the octave of the note by either doubling the frequency, or cutting it in half. That means that it is still an A if it has a frequency of 220 Hz or 880 Hz.
The frequency of the note is determined by a couple of factors. The main fac
Bowling has been a favorite past time for so many for so long. It is a sport that unites people from all parts of the world. Though the techniques may vary, some more unorthodox then others, some with spin, some with a simple flick of the wrist, the physics behind it is ever present.
Most standard bowling balls have weights in them, but there are two major types, symmetric and asymmetric. Though they perform very similarly, the asymmetric weights give the bowlers a little more tweak in their
In 1936, A British zoologist named James Gray was baffled by the speed of dolphins. These dolphins were able to reach speeds of over 20 miles per hour! He examined the dolphins muscles and demonstrated that they weren't built to reach that kind of acceleration with drag. He chalked that up to their skin and that was the accepted answer..... was.
It turned out that Gray was wrong. Dolphins are amazing creatures and it turns out, Gray didn't give these water dwelling mammals enough credit!!!! A
In Quantum Mechanics, there is a phenomenon called Quantum Tunneling. This is where a particle "tunnels" through a "barrier". I know you're probably saying, Dan! Why should we car about this??? well listen up, and I'll tell you.
This is important because this explains the nuclear fusion that occurs in the main sequence stars like the sun. Normally nuclear fusion requires a lot of energy to get these particles to collide but quantum tunneling uses a lot less energy. Quantum tunneling is very
Now that the History and base of Quantum Physics has been established, we can start the fun stuff. The first question of any good scientific theory is this, How can I prove this?
I'll start with my personal favorite, the double-slit experiment, also known as Young's experiment. A double slit is basically a diffraction grating. When light goes through a diffraction grating, well a basic double slit one, it has a banded pattern, the same thing happens with any wave. When a particle Is shot thro
The first step in learning more about Quantum Physics is understanding what Quantum Physics means. Newton was a brilliant man and was great at explaining all the big things. But as things get smaller and smaller, these classical laws of physics break down. As we get down to macroscopic matter, they posses properties unlike those of bigger objects that Newton knew of.
The basic idea behind quantum physics is that matter has both wave like and particle like properties. Quantum physics deals wit
Physics is ever prevalent in the world of sports. Tennis is no exception to that.
A tennis racquet, much like a baseball bat, has a sweet spot. A tennis racquet however, has 3 so called sweet spots. One is right by the center, and this is a node. A player will feel little to no vibration when the ball is hit in this spot. There is another sweet spot is at the center of percussion. The COM is located shortly below the node. The third spot is located even below that, and it is at this spot wher
CD's are something that everybody has had or has. But for such a universal product, we really don't know how they work...
Although the disc looks and feels flat, it actually is quite the contrary. On a CD is a ton of little pits. These pits have binary code in them. Then a Focusing laser goes over the pits, receives the code, and transfers it to a detection circuitry. The digital signal received is then converted to analog form by a D/A converter.
The Laser used is a semiconductor laser. T
Guitar players have many techniques in their arsenal. A guitar is a very versatile instrument and has the potential to make many different sounds, few more distinct than the pinch harmonic, also known as pick harmonic, or a squealy.
The basic technique behind it is that right after you hit the string, the string hits your finger. This cancels out the fundamental frequency and all overtones, except those that have a node at that location. Overtones that are a multiple of the intended overtone
Holography is the art of 'lensless photography'. It is typically formed by reflected light captured on film. For example, a laser would hit an object. The object then reflects the light, and the reflection of the light is what is captured on the film. The images from a hologram contains more information than a traditionally photograph. The image is three dimensional and exhibits parallax.
Holograms have cool properties that aren't displayed in photos. My personal favorite is that in a transmi
Soccer, the most popular game in the world, has a lot of physics under the surface.
The first is Newtons first law. The law of inertia. The ball stays at rest until acted upon. usually by a players foot. Then it stops only by an outside force. This could be friction from the field, air resistance, or another player. You can also factor in Newton's other two laws as well as momentum and a variety of others.
The best physics in my opinion however, is the bending of the ball on a shot, or the
The pages of APlusPhysics.com, Physics in Action podcasts, and other online media at this site are made available as a service to physics students, instructors, and others. Their use is encouraged and is free of charge. Teachers who wish to use materials either in a classroom demonstration format or as part of an interactive activity/lesson are granted permission (and encouraged) to do so. Linking to information on this site is allowed and encouraged, but content from APlusPhysics may not be made available elsewhere on the Internet without the author's written permission.
APlusPhysics.com, Silly Beagle Productions and Physics In Action materials are copyright protected and the author restricts their use to online usage through a live internet connection. Any downloading of files to other storage devices (hard drives, web servers, school servers, CDs, etc.) with the exception of Physics In Action podcast episodes is prohibited. The use of images, text and animations in other projects (including non-profit endeavors) is also prohibited. Requests for permission to use such material on other projects may be submitted in writing to email@example.com. Licensing of the content of APlusPhysics.com for other uses may be considered in the future.