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Was in charge of my nephews this weekend, 3 & 6, and we have been learning about magnets. Was just using a cheap Science Museum kit, so the magnets were a bit lacklustre. All the same they really enjoyed it.
Next time they are here, I am going to plan some fun with iron filings and whatnot, but need to get some stronger magnets. Looking on Amazon, there seems to be a choice between [url= http://www.amazon.co.uk/Magnet-Expert-Educational-Magnets-Identified/dp/B001RX0KFO/ref=sr_1_6?ie=UTF8&qid=1402220351&sr=8-6&keywords=iron+filings ]weak-ish educational ones[/url], and the ridonkulously powerful, but eminently swallowable, neodymium ones.
Is there something out there which is of a reasonable size, and strength, for kids to use? Or maybe some sort of holder or mount, to fit neodymium magnets in, so they are useable for small hands.
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Get a couple of those magnetic telescopic picker upper things. I've got a couple that are pretty strong. Strong enough to move a 1/4 ball bearing through 9mm mdf anyways.
I'd have thought that if you're just pulling iron filings about, the weak ones will be fine.
Getting them to stick on the fridge door might be a challenge, though.
Sorry, I'm not helping, am I?
Getting them to stick on the fridge door might be a challenge, though.
Planning on doing it through a 20mm table.
...plus there may be hands getting pinned to the fridge.
....but not this:
[url= https://www.cromwell.co.uk/index.php?q=0&p=browse&c=030203&ss=Magnet ]Failing that, try here. [/url]
The old fashioned cycle computer spoke magnets are OK, if all you need is a dinky little magnet. They can also be used for getting the bits of Powerlink out of coffee jars half full of degreaser.
Edit: Forget this, they obviously won't work through 20mm of table.
Old speakers can have some great magnets in them
Get a neodymium magnet with a hole iin it and screw in to something?
If you have any old hard drives kicking around they have some pretty strong magnets in them.
Get a neodymium magnet with a hole iin it and screw in to something?
Hmm. I like your thinking.
Not the children in question!
My magnet needs are filled by [url= http://www.first4magnets.com ]Magnet Experts[/url]
Actually, 'a magnet for kids' did seem the opportunity for a cheap Savile joke
You could show them how to make electromagnets too...
Not quite what you want but at some point get some geomag
http://www.geomagworld.com/eng/
Teaching physics in schools these are good for a bit of force. Fragile but cheap
(10 for £3.71)
I think this what we use for field patterns and dropping through coils. They look pricey though
Our kids had a load of GeoMag when growing up. Really recommended if they like making stuff and super-powerful magnets.
Ditto GeoMag and hard drives.
I managed to get a new tv as a result of Jnr messing around with magnets and CRT tv. I don't think LED mind.
I sent a CRT TV a bit funny by showing fast young git what the magnet did to the electron beams. It sorted itself out slowly, perhaps due to the degaussing boyying sound each time it was turned on.