@physicsfun

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2022-06-28 15:45:50

Dancing Ferrofluid: a black magnetic fluid interacts with a variable strength electromagnet (like those found in speakers). A circuit supplies power to the electromagnet in proportion to the sound waves picked up by a microphone, the changing magnetic field- combined with the liquid surface tension of the colloidal ferromagnetic liquid- produces the captivating motion that keeps time with any music played. Featuring “12 String Thing”, composed and performed by my good friend T.D.Clark tdclark67 ➡️ Follow the link in my physicsfun profile for info on where to get this device and other amazing ferrofluid displays. #ferrofluid #speaker #interactivelamp #fluiddynamics #magnets #magneticfield #magnetism #colloidal #physics #physicstoy #science #surfacetension #physicsfun #neodymium #guitar #electromagnet #scienceisawesome #electromagnetism

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2022-06-27 16:01:31

Maxwell’s Dynamical Top: one of my favorite demonstrations of the strange properties of rotating bodies- shown here with a 1/2 scale but exacting replica of the famous “Dynamical Top” created and demonstrated by the great physicist James Clerk Maxwell in 1857. When this brass bell shaped top is spinning an interesting stability can occur- push on the pointed stem and the top will push back, forcing the stem against that object, and friction will cause the stem to roll along and trace the edge of the object. Note- magnets are NOT involved here. The key to this design is to make the contact point/tip of the top at its own center of mass, then any frictional force in contact with the stem will produce a torque about the contact point at a right angle to the direction of friction that creates the stabilizing force (students of physics may recognize application of the right hand rule here). This beautiful historical replica is now available from machinist and creator Jim Peever machinedmarvels- and as far as I know the only other replicas of this device where made in the 1880’s ➡️ Follow the link in my profile for info on where to get this scientific replica top and many other amazing items featured here on physicsfun #angularmomentum #rotation #torque #vector #vectoraddition #precession #physicsfun #physics #physicstoy #MaxwellsTop #dynamical #spiral #friction #rollingwithoutslipping #spinningtop #science #gyroscope #gyroscopic #scienceisawesome

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2022-06-26 15:29:38

The PiTOP: this beautiful brass cylinder has a radius of 1 inch, a height of 1/π inches, and displays the first 109 digits of π on its face. Spin this disk (best with sound on) and it will demonstrate some very interesting physics involving energy transfer and conservation of angular momentum. The edges of the cylinder are rounded and engineered to exhibit an optimum motion of a “spolling” coin, a motion that combines spinning and rolling (closeup shown in 240fps). As the disk’s angle of inclination decreases the speed of the rolling increases dramatically until the contact point with the mirror is moving in excess of 200mph. From the mind of physicist Ken Brecher, inventor of the PhiTOP and other math constant spin tops. Note also that with the specified height, that the volume of this cylinder is exactly 1 cubic inch! ➡️ Follow the link in my profile for info on where buy a PiTOP and other amazing items featured here on physicsfun #pi #piday #spinning #physics #physicstoy #angularmomentum #dissipative #precession #sprolling #physicsfun #precessionrate #spinning #spinningtop #rollingfriction #science #scienceisawesome

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2022-06-25 15:44:32

Thermochromic Liquid Crystal “Mood” Necklace: heat from a hand brings out the temperature dependent color change of the liquid crystal- the chemical formulation used in this pendant is especially dramatic from yellow to violet. The molecules of the liquid crystal change orientation and spacing during the phase transition from liquid (warm) to crystal (cool). The molecular configuration shift allows for different diffraction effects producing the color shift. ➡️ Follow the link in my profile for info on where to buy similar mood jewelry and other amazing things featured here on physicsfun #thermochromic #liquidcrystal #physics #physicstoy #phase #physicsfun #phasetransition #chiral #science #thermometer #braggdiffraction #diffraction #interference #solidstate #chemistry #science #scienceisawesome #moodring #throwback #thermodynamics

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2022-06-24 17:38:43

Thermochromic Safety Sticker: the liquid crystal ester dye in this reusable sticker is calibrated to change color when the surface temperature exceeds 50°C (122°F)- that at which prolonged contact (more than 0.5s) with metal risks burns to skin. Here the safety sticker is attached to a slab of aluminum and heated with a simple candle- it took about 3.5 minutes for the heat to distribute and bring the aluminum to the threshold temperature. When the surface cools the sticker again appears blank and can transition over and over again. ➡️ Follow the link in my profile for info on where the buy this safety sticker and other amazing items featured here on physicsfun. #physics #physicstoy #physicsfun #thermodynamics #heat #physicsdemo #liquidcrystal #thermometer #heattransfer #conductivity #phase #phasetransition #science #scienceexperiment #scienceisawesome

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2022-06-23 16:54:38

Pythagorean Puzzle: a proof, in physical form, of one of the most famous equations concerning the sides of any right triangle. The area of a square with side c of the hypotenuse is indeed equal to the sum of the areas of the squares of side a and b. This kit also allows at least two other ways to prove this theorem named after the famous Greek mathematician from 500 BC. One of the most used formulas when calculating vectors in physics classes 😬 ➡️ Follow the link in my profile for info on where to get this and other amazing items featured here on physicsfun #math #mathtoy #triangle #square #polygon #pythagoras #pythagoreantheorem #trigonometry #dissection #geometry #tiling #mathpuzzle #physicstoy #science #scienceisawesome #mathstoy

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2022-06-22 17:15:36

Tiny Leaf Blower Toy: this little battery operated blower is great for experimenting with the Coandă effect. Here an air stream attaches and wraps around the styrofoam ball trapping it in the center of the stream. As the air changes direction to flow around the ball, momentum is imparted to push the ball against gravity and levitating it in equilibrium. A cylinder constrains the airflow and temporarily changes the dynamics which allows the airstream to push the ball up and out- and if one aims carefully the ball will fall back into the Coandă effect trap. ➡️ Follow the link in my profile for info on where to find this and other amazing items featured here on physicsfun #coanda #coandaeffect #gravity #newton#newtonssecondlaw #newtonsthirdlaw #actionreaction #equilibrium #netforce #physics #physicstoy #magnuseffect #science #scienceisawesome

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2022-06-21 16:40:11

Horizontal Hand Boiler: Amontons’s Law in action as heat from the hand raises the temperature of the dichloromethane vapor the pressure increases in one bulb pushing the red (dyed) liquid through the glass pipe to the other bulb. The process can repeat by switching the hand to the other side, but as both sides heat up the transfer is less vigorous. An inexpensive toy demonstrating gas laws under constant volume and other thermodynamic physics. ➡️ Follow the link in my profile for info on where to get this and other amazing items featured here on physicsfun #thermodynamics #phase #physics #physicstoy #phasetransition #physicsfun #phasechange #heat #handboiler #dichloromethane #idealgas #PV=nRT #science #scienceisawesome

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2022-06-20 18:57:09

Drinking Dino Heat Engine: the “Dippy Dino” heat engine- where cooling by evaporation at the head leads to lower pressure in the top bulb such that the dichloromethane fluid (colored green) rises up the neck making the T-Rex top heavy and the dino tips over dipping its face in the water and letting the fluid return to the bottom bulb. The process repeats as long as the top stays wet. A fun and silly variation on the famous drinking bird physics toy- and the T-Rex was a closely related ancestor to the dinosaurs that live today- birds! ➡️ Follow the link in my profile to buy one of these and many other amazing items featured here on physicsfun #engine #heat #heatengine #thermodynamics #drinkingbird #physics #physicstoy #cycle #dippydino #drinkingdino #tyrannosaurusrex #dippybird #dunkingbird #simpleengine #vaporpressure #latentheat #mechanicalwork #physicsfun #science #scienceisawesome

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2022-06-19 14:39:14

Buoyancy Discrepant Event: wood that sinks and a rock that floats!- a study in density properties of ironwood and pumice. ➡️ Follow the link in my profile for info on where to get an ironwood sample and other amazing items featured here on physicsfun #rockhound #buoyancy #fluiddynamics #physics #physicsfun #physicstoy #achimedes #archimedesprinciple #bouyantforce #ironwood #pumice #density #science #scienceisawesome

9047     40
2022-06-18 16:02:45

Levitation Lamp: tapping the floating spherical magnet turns this LED lamp off and on in this interesting design. The magnet floats a couple centimeters from the surface of the base when plugged in, and feels springy to the touch. Within the base is a control system with adjustable electromagnet coils in a feedback loop with Hall effect sensors which allow for fine tuning of a magnetic field to precisely balance the pull of gravity. ➡️ Follow the link in my profile for info about where to get this lamp and other amazing items featured here on physicsfun #equilibrium #neodymium #magnetic #magneticfield #halleffect #feedbackloop #controlsystem #physics #physicstoy #physicsfun #electricalengineering #faradayslaw #electromagnetism #electromagnet #halleffectprobe #science #levitation #scienceisawesome #maglev

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2022-06-17 16:41:26

Magnetic Field Viewer: visualizing the invisible- tiny iron filings suspended in viscous oil gracefully chain up along the magnetic field lines of the ferromagnet, revealing its dipole configuration. ➡️ Follow the link in my profile for info on where to get this and other amazing items featured here on physicsfun #magnetic #magneticfield #magneticdipole #dipole #physics #physicsfun #physicstoy #magnet #electromagnetism #science #Faraday #cowmagnet #dipolefield #scienceisawesome

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