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physicsfun  Physics describes the real magic of the universe. Visit my store! ➡️ Follow this link:

Colored Ferrofluid Display Cells: spectacular metallic blue, gold, and black display cells by @czferro - colloidal ferromagnetic liquids in a specially prepared water-alcohol suspension. Curious behavior results from the interplay between magnetic force and surface tension. The gold and blue coloring appears to be from a thin coating at the boundary between the ferrofluid and the suspension liquid. Still exploring the details of the coloring and the specific makeup of the clear suspension fluid - both trade secrets it seems. ➡️ Follow the link in my @physicsfun profile for info on where to get these and other amazing ferrofluid displays. #ferrofluid #fluiddynamics #magnets #magneticfield #magnetism #colloidal #physics #physicstoy #science #surfacetension #neodymium #conceptzero #goldferrofluid #scienceisawesome #electromagnetism

Faraday Train: two magnets, one battery, and a coil of bare copper wire are the simple essence of this self propelled craft. The magnets conduct electricity, thus when put in contact with the coil current will flow creating a solenoidal magnetic field in the vicinity of the battery, which in turn pushes on the magnets at each end of the battery moving the craft along. The spherical neodymium magnets used allows the craft to slide along the coil with minimal friction. ➡️ Follow the link in my profile to buy the parts to make your own and to find many of the amazing items featured here on @physicsfun #faraday #faradaytrain #physics #physicstoy #coil #solenoid #electromagnet #electromagnetism #neodymium #magnet #ampere #ampereslaw #magneticfield #magneticrepulsion #magneticforce #science #maker #diy #scienceisawesome #backemf

Ambiguous Object Illusion: an incredible new design by Kokichi Sugihara of Meiji University in Japan, the inventor of this illusion and art form. A clever combination of reflection, perspective, and viewing angle produce this striking illusion. My vote for best gift from the G4G13 exchange this year. ➡️Follow the link in my profile for info about where to get the amazing items featured here on @physicsfun #illusion #ambiguouscylinderillusion #ambiguouscylinder #geometry #mirrorreflection #physics #ambiguousobject #kokichisugihara #physicstoy #math #mathtoy #mathstoy #optics #opticalillusion #3dprinting #perspective #science #scienceisawesome

Catenary Curve: the Gateway Arch matches the shape of a chain hanging from two ends, a curve known as the catenary or hyperbolic cosine- demonstrated here with a scale model souvenir (1”=100’). When an arch is built in the shape of this special mathematical curve the compression forces between each segment are always parallel to the curve- the arch is stable with no tendency to buckle. Famously used in architecture, from the buttresses of Notre Dame to the Gateway Arch. ➡️ Follow the link in my profile for more info and where to find many of the amazing items featured here on @physicsfun #exploratorium #catenary #hyperboliccosine #gatewayarch #alysiod #architecture #catenaryarch #uniformload #physics #physicstoy #science #scienceisawesome

Balance Drinking Vessel: physics meets design in this stainless steel cup- when empty the cup tilts to one side, but when full it stands straight. The walls of this spherical vessel are hollow, asymmetric, and weighted, designed with the center of mass displaced from the symmetry axis such that the empty cup rests in stable equilibrium at a 23 degree tilt. The addition of mass (pouring a drink) within the offset interior of the cup places the center of mass (cup + contents) onto the symmetry axis allowing an upright stable equilibrium. Designed by Katja Hoeltermann for Carl Mertens design of Solingen Germany. ➡️ Follow the link in my profile for more info and learn where to buy this vessel and other amazing items featured here on @physicsfun #physics #physicstoy #centerofmass #balance #balancetoy #CarlMertens #equilibrium #stableequilibrium #symmetry #symmetryaxis #science #scienceisawesome

Floating Hourglass Puzzle: famous physics puzzle- why does the hourglass not start rising right away? The glass only ascends after about half of the sand has transferred to the lower bulb. The hourglass is a normal glass timer, it is submersed in plain water, and the main tube has an inner diameter which is at least 5mm larger than the diameter of the glass. A simple physics property of the hourglass changes and explains this behavior. I'll post the answer in a few days. Another puzzle made famous by Martin Gardner as we wind down G4G. ⌛️⏳⌛️⏳➡️ Answer: Wow! Thanks for all the thoughtful comments and creative explanations- I enjoyed reading them all. I believe the best explanation is that initially the hourglass is top heavy, so it leans against the inner wall of the tube hard enough that friction holds it in place. As time goes by the sand moves from the upper chamber to the lower such that the center of mass of the tube transfers to the bottom, and the hourglass then straightens up and ascends. This explanation nicely emphasizes the property of the hourglass that changes- its center of mass. ➡️ Follow the link in my profile for info on where to get many of the amazing items featured here on @physicsfun #physics #physicstoy #physicspuzzle #puzzle #buoyancy #hourglass #float #gravity #torque #force #friction #science #scienceisawesome #G4G #floatinghourglass

Spiram Siderum: a spiral of foil holographic stars turns on an axis held by magnets in delicate equilibrium against gravity- allowing for graceful rotation and playful interaction with light. A puff of air sends it spinning. A small kinetic art object that I created for G4G13 and gave out as my part in the gift exchange. ➡️ Follow the link in my profile for information on where to get or how to make the amazing items featured here on @physicsfun #physicsfun #physics #math #mathtoy #mathstoys #kineticart #spiral #stars #magneticfields #neodymium #science #scienceisawesome #G4G

Bouncing Ball @exploratorium : a steel ball bounces more than 230 times (counted using slow motion video) before coming to rest in this exhibit demonstrating the physics of a high coefficient of restitution. The bottom plate is amorphous steel and attached firmly to a massive block of concrete to enable the ball to retain as much kinetic energy as possible after each collision. 🌟 With special thanks to the Exploratorium! ➡️ Follow the link in my profile for more info and where to find many of the amazing items featured here on @physicsfun #exploratorium #kineticenergy #physics #collision #conservationofmomentum #coefficientofrestitution #physicstoy #kineticart #bounce #bouncingball #elastisity #science #scienceisawesome

Trihexaflexagon: folded and glued out of a strip of paper this object has six distinct sides made from three sets of triangle panels. G4G week- Discovered in 1939 by mathematician Author Stone and developed along with fellow Princeton student Richard Feynman and others, but made popular by Martin Gardner. ➡️ Follow the link in my @physicsfun profile to make one yourself with scissors, white glue, and a printer. #math #mathtoy #mathstoy #hexaflexagon #trihexaflexagon #Feynman #topology #physics #physicstoy #geometry #martingardner #origami #science #algorithm #MartinGardener #G4G #scienceisawesome

Bottle, Hoop, and Nail Trick: with some practice, a snap of the wrist removes the hoop and the nail falls straight into the bottle. Newton's 1st Law as seen in slow motion- a mass at rest tends to stay at rest. (Best to watch with sound/audio) Balancing the nail on the hoop ensures the nail is directly over the top of the bottle. The hoop is removed so quickly that it does not interact significantly with the sufficiently massive nail, and thus the nail remains over the mouth of the bottle so that gravity pulls it in. G4G Week repost- a favorite from Martin Gardner’s collections of physics tricks. ➡️ Follow the link in my profile for info on where to get this and many other amazing items featured here on @physicsfun #iPhoneSloMo #250fps #physics #physicstoy #isaacnewton #Newtonsfirstlaw #bottlehoopnail #impulse #inertia #lawofinertia #science #scienceisawesome #MartinGardner #impulse #G4G

Tessellating Geckos: MC Escher inspired lizard cutouts interlock precisely to tile a surface with no overlaps or gaps. Laser cut from maple, walnut, and cherry wood by maker/artist Craig Caesar and inspired by MC Escher’s “Study of Regular Division of a Plane with Reptiles” 1939. G4G week: Martin Gardner wrote about the art and math of Escher in 1961- which helped create the popularity that his work has experienced ever since. ➡️ Follow the link in my profile for info on where to get this and many amazing math and science toys featured here on @physicsfun #tesselation #tessellations #MCEscher #Escher #math #physicstoy #mathtoy #mathstoy #maths #gecko #puzzle #interlocking #tiling #martingardner #G4G #scienceisawesome

Mirror Anamorphosis: this famous print by artist István Orosz has a hidden anamorphic image revealed by placing a mirrored cylinder over the depiction of the moon in the image. The work visualizes a scene from the book “The Mysterious Island” by the science-fiction author Jules Verne- whose portrait emerges in the reflection on the cylinder. The math describing this mapping is quite complex and was given in detail in a physics journal in 2000, but before that Martin Gardner described the math in 1975. Repost for this week’s theme as I head to G4G! ➡️ To learn more and to find out where to get this poster please follow the link in my @physicsfun profile. #math #mathtoy #anamorphos #art #physics #physicstoy #mirror #cylinder #Orosz #IstvanOrosz #science #anamorphic #anamorphicart #scienceisawesome #anamorphosis #JulesVerne #martingardner #G4G #cylindrical #perspective #mirrorAnamorphosis #mathstoy #geometricprojection

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