In March, brand-new Twitter account @SciSupport_BN mysteriously answered science questions, many of which had gone unanswered for years. The real fun started when Bill Nye himself filmed the replies. Read the rest
Neodynmium magnets and a high speed camera? It turns out it is, as the kids say, oddly satisfying. I was practicing with some macro shots with the Chronos high speed camera, using LED lighting and filming at around 4000 frames per second. I dropped some hard drive magnets and noticed the magnets behaved very oddly and unpredictably.
I’ve been playing with my FEEL FLUX for weeks and its hit rate in the amazement department is 100%.
Each time you drop the metal ball through the copper tube you’d expect it to zip out the other end but instead, it lazily creeps from one end to the other and dribbles out into your waiting hand.
A “Silent Catch” is what happens when you toss the ball into the FF and it slowly glides down the sides without making contact with it. I have to say that it’s satisfying and magical every time I pull off the maneuver.
As the ball glides down the tube, the magnetic field changes inside the metal wall and when this happens, a bit of voltage is created. This reaction is not unlike a tiny, temporary battery and is called an electromotive force. The movement pattern of the voltage moves down with the ball and looks like this:
What could be simpler?
The tube’s material is an electrical conductor and drives current around in circles as the ball descends. The scientists at my laboratory tell me that when this happens, a second magnetic field is created that opposes the downward motion of the magnetic ball. The ball wants to fall through the tube at 9.8 meters per second but the field wants to halt it and of course, gravity wins in the end. And here’s the crazy part – the faster the initial downward motion, the more powerful the slowing force becomes. Read the rest
Here's cobrakiller2000's homemade Levitron-style magnetic top. He says:
The only non-electric way that I know off to get a magnet fully levitating over a magnet and with nice elevation too. Looks way cool and is just overall a beautiful invention in my opinion. Was hard to pull this off. I struggled for weeks before I got it levitating - very delicate system. Yes, gyroscopic forces keep it from tipping over and therefore keeps it in repelling mode as long the rpm are high enough.Read the rest
Joe Hanson from It’s Okay to be Smart and Dianna Cowern from Physics Girl met up with Joe DiPrima of Arc Attack to sear aluminum cans apart with a powerful electromagnet.
Read the rest
Watch a soda can rip itself apart in a fiery explosion at 11,000fps with a Phantom high speed camera. Running a current through a coil, produces an electromagnet. Turn up the voltage in this experiment, and make that current strong enough, and your electromagnet can rip a soda can in half. Or rather, make the can rip itself in half!
Kaplamino made this delightful Rube Goldberg-esque demo using magnets and steel balls.
Brainiac75 made a pair of wooden tools that he uses to separate and stack large neodymium magnet discs. I've pinched my fingers quite a few times with tiny neodymium magnet discs and have learned to respect them. These big ones are very dangerous. You could easily lose a finger if these magnets were to smack into one another. Please get some thick gloves, Brainiac75! Read the rest
"The aim of the wise is not to secure pleasure, but to avoid pain." – Aristotle Read the rest
I missed this video when Scott Lawson released it in 2013. It's a 50 second timelapse taken over 1.5 hour period, showing some magnetic silly putty surrounding itself around a neodymium magnet. Read the rest
On Instructables, DIYHacksAndHowTos has a great method for separating a cheap stapler and sticking magnets on both halves, enabling you to center-staple booklets and the like. Every year or two, I do something zine-like that requires this sort of thing, and I always end up wasting money on a long-reach stapler that's always lost by the time the next project rolls around. (Don't get me wrong, long-reach staplers are awesome, but if you only need to do booklets once every year or two, they're a lot of investment). This is what I'll do next time (and as a bonus, it'll be great for kid craft projects where we want to use a staple in th center of a large sheet of paper).
Read the rest
One limitation of a typical office stapler is that it only lets you staple about 3 1/2" into the paper. This isn't enough for a lot of projects. If you want to put together your own comic book or a large banner, you are usually stuck stapling your project onto a piece of cardboard or carpet and then bending the legs of the staple by hand. They do sell extra long staplers or staplers with swivel heads but they still have their limitations.
A better option would be to make a stapler with a detachable base. The base would be positioned under the paper and aligned to the top half of the stapler with magnets. This would allow you to staple any area of a project regardless of location.