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From Educational Innovations: BUY NOW Beat Interference Chimes
Wikipedia: Features a nice introduction and helpful graphics explaining the physics of this beat interference phenomena.
Beat Interference Chimes: these aluminum chimes resonate at slightly different frequencies. When both chimes are struck the sound waves interfere both constructively and deconstructively producing the interesting wavering sound called a beat. The beat frequency- the rate at which the sound goes loud to quiet- is equal to the difference between the frequencies of the two chimes. The same physics applies when tuning a guitar using fifth and seventh fret harmonics.
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From Etsy: BUY NOW
Hyperboloid Pencil Holder
don't forget a set of pencils:
From Amazon: BUY NOW
Colored Pencil Sets
Better yet- get some thermochromic color changing pencils!
From Educational Innovations: BUY NOW
Pencil Hyperboloid: a perfect gift for any math teacher- the precisely oriented holes in this base direct 16 pencils to reveal a hyperboloid, the 3D surface traced by revolving a diagonal(skew) line, the outline of which is the conic section of the hyperbola. A doubly ruled surface for any desktop!
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From Educational Innovations: BUY NOW Melting Snowman Kit
Viscoelastic "Melting Snowman": non-newtonian flow is demonstrated by these blobs of viscoelastic silicon polymer (aka Silly Putty) in the shape of snowman- if force is applied over a short period of time the substance shows elastic properties (bounces like a superball), but if the force is applied slowly the substance flows like a viscous liquid (flattens under gravity over a few hours as shown here). Thus this snowman does not melt because it is already liquid, one that flows slowly though. Mostly sold as a toy, Silly Putty was discovered after mixing boric acid with silicone oil during World War II in an attempt to find a rubber substitute.
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From Educational Innovations: BUY NOW: Dancing Helix
The Dancing Helix: This kinetic mobile's mesmerizing motion arises from pulsed torsion waves that propagate up and down the length of a series of weighed rods connected by an elastic ribbon (which acts as a torsion spring). The waves arise by a special pulsed motor from which the strand hangs, and only spins for a second or so out of each minute. The twisting waves then constructively and deconstructively interfere creating an array of flowing motions.
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From Educational Innovations: BUY NOW Eddy Current tubes
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From Educational Innovations: BUY NOW Magnetic Viewing Film
Lenz's Law: a strong neodymium magnet falls slowly down a copper bus bar as though passing through a viscous liquid. Since magnetic fields pass through copper, magneview film reveals the location of the falling dipole magnet. Moving magnetic fields from the falling magnet produce electric currents in the copper. These currents then produce magnetic fields that have the opposite polarity to the initial field. So a falling magnet makes the copper pipe briefly into an electromagnet that repels the magnet. The rectangular copper “pipe” is from a water-cooled electromagnet power supply line, 1.5 x 2 in (4 x 5 cm) in cross-section, designed to supply a steady DC current of 5000 amps. This 15” long piece weighs in at 12 lbs and has a 1/2” diameter hole for coolIng water to flow down its center. From a decommissioned particle accelerator magnet.
This kit has everything needed to make your own polariscope:
From Educational Innovations: BUY NOW Polarizing Film Kit
The kit also includes a birefringent crystal, colorful optically active mica sheets, and a polarimetry demo that reveals when structures are under stress. A great value for so much physics fun!
Simple Polariscope: polarized light reveals the hidden rainbows due to internal stresses imposed on polymer materials such as these pieces of polystyrene flatware, a technique used to model stress distribution patterns in engineering. Place the polymer samples between two linear polarizer filters and the internal stresses created by the molding process during manufacturing produce colors through birefringence due to photoelasticity.
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From Art of Play: BUY NOW
Why does it look like a bubble when moving fast? Wikipedia has the details: when the object exceeds a certain speed the flicker fusion frequency of our vision produces the bubble illusion.
The physics of the toroflux is wonderfully illustrated and explained in this article by Daniel Walsh.
Mini-Toroflux: kinetic art toy made from a single continuous loop of stainless steel band. The band of spring metal is woven such that it forms a torus that can clamp on to and roll down a stick or in this case s segment of cord. This miniature version loops through itself nine times which requires the spring ribbon to twist creating a tension such that when released the spring will pop into its minimum energy state- a flower-like torus. Amazing combination of math and kinetic art invented by Jochen Valett. Thanks to Tim Rowett for sending me this rare mini version for my collection.
The heat pipe kit includes the pipe and a copper rod:
From Educational Innovations: BUY NOW Heat Pipe Demo Kit
Here is the liquid crystal sheet used in the video (range 20-25C):
From Educational Innovations: BUY NOW liquid crystal thermometer sheet
Heat Pipe: a device that transfers heat with great efficiency- as demonstrated by this fantastic kit from @educational_innovations . Here a liquid crystal goes from green (room temp) to black (near freezing) showing the heat transfer to a piece of ice through a heat pipe (top) and a similar sized piece of solid copper rod (bottom). As you can see the heat pipe cools much faster than the copper rod even though copper is an excellent conductor of heat. The heat pipe is a thin shell of copper that surrounds a tube of sponge like material filled with some water vapor and sealed with a low pressure inside. The heat is transferred from one end to the other by the phase transition of water- at the warm end water in the sponge evaporates into vapor absorbing heat energy, the vapor travels down the hollow core to the cold end where it condenses into liquid releasing heat energy. The water is wicked by the sponge to the warm end and the process repeats. Heat pipes like this one pull heat away from the CPUs in modern computers preventing them from melting. The amazing heat transfer ability is clearly felt in the fingertips if one places the copper rod and heat pipe into a glass of ice water-the heat pipe immediately gets cold!
The essence of a great physics toy: simple design showing comlex physics
From Educational Innovations: BUY NOW Reaction Rocket
Reaction Rocket: projectile launch via momentum transfer in slow motion. The superball/straw base bounces off the table top and then immediately collides with the bottom of the rocket sending it off with a velocity slightly less than 3 times the velocity of the rising ball (true if the ball is more than three times the mass of the rocket). Newton's third law in action! Note that the rocket rises much higher than the drop height (up to 9 times higher).