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👉🏻 Wringing Gauge Blocks: two blocks of metal (not magnets!) will stick together by a process called wringing if their surfaces are flat to high precision – such as these gauge blocks found in most machine shops. Here two blocks are forced apart with a snap, and then wrung back together with the characteristic sliding motion technique. Gauge blocks are flat to less that one millionth of a meter and are used by machinists for precision length measurements and calibration. The science of the wring force remains somewhat a mystery and no one has yet found a fully accepted physics description- but we do know that blocks will wring in a vacuum and that the force can be up to 30 times that of weight of the blocks. Fun physics from the shop!
👉🏻 Dancing Drops @exploratorium: an exhibit employing the Coandă effect on water droplets -an air stream attaches and wraps around the drops temporarily trapping them. As the air changes direction to flow around a drop, momentum is imparted to it pushing the drop against gravity. Constrained mostly by surface tension, under these conditions the water drops also have irregular and changing shapes leading to erratic motions in the uneven airstream.🌟 With special thanks to the Exploratorium!
👉🏻 Popsicle Stick Bomb: a form of simple tensegrity, the elastic potential energy of the bent sticks is dramatically released under application of a slight concussive force such as an impact with a table top- shown in forward and backward slow motion. Featured here is one of the simplest constructions with 5 flat sticks woven into a spring-loaded configuration held in place by friction and tension induced by the bending of the wood. A nice demonstration of energy conversion- potential to kinetic.
👉🏻 Deluxe Button Buzzer
👉🏻 Chinese magic mirror
👉🏻 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.
👉🏻 Lissajous Roller: when viewing this 3D printed object from the side one sees a projection of a 3:2 Lissajous curve, but the object is actually cylindrical in frame and can roll towards or away from the viewer. When in motion a “dual axis illusion” is produced where the object appears to be rotating about a vertical axis. Invented by Bill Gosper and produced by Pyrigan & Co.
👉🏻 Super Absorbent Polymer: poly-acrylamide polymer crystals are able to absorb up to 200 times their volume of water. Here seven small spheres, approximately 4mm in diameter, were immersed in water for three hours, after which they were slightly more than 23mm across. The final gel sphere is more than 99.5% water!
👉🏻 Rolling Marble Sculpture: marbles perform gymnastics as potential energy of gravity is converted to kinetic energy. An elegantly designed auger conveyor, an Archimedes’ Screw, brings the marbles back to the top (powered by an AA battery and a small motor).
👉🏻 Sp!n Top: once set into motion the eye only perceives the punctuation mark ! in the center of a ring, with the vertical line seemingly suspended in space above the dot. The rate of spin is above the flicker fusion threshold of human vision, and the crossbars become blurred out and invisible- the effect is even more pronounced in person (hard to capture on video). Physics and psychophysics combine to produce this wonderful illusion!
👉🏻 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!
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