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Science trick for the half term

(9 Posts)
Blandmum Mon 29-May-06 09:08:27

you will need a paper clip, a magnet , some sewing thread and a bit of sticky tape.

Tie the paper clip to one end of the thread. Stick the other end of the thread to a flat surface.

Hold the paper clip up in he air, so that the thread is fully extended.

With your other hand , hold the magment a fer millimeters abover the paper clip (don't let it touch). This takes a bit of practice!

The paper clip will 'levitate, when the downwards force of gravity is equaled but the upwards attractive force of the magnet!

Magic, flying paper clips LOL

You can now see which compounds will let the magnetism 'through'...paper and card will, but iron sheets will not...the iron will shield the magnetism.

Should buy you 30 minutes of quiet ladies!

Twiglett Mon 29-May-06 09:09:31

my brian hurts

Twiglett Mon 29-May-06 09:09:49

I do what wiv da wat? doh

Twiglett Mon 29-May-06 09:10:10

how do you do volcanoes?

LadySherlockofLGJ Mon 29-May-06 09:10:58

Poor Brian, give him some parcetamol and a hot drink.

Blandmum Mon 29-May-06 09:12:49

Volcanos

Easy

Make your vbolcano with a holder at the top end. mix some bicarbonate of sodium with red food colour (if you wish) Add vinegar. Reaction takes place making an acetic salt of sodium, carbon dioxide (the fizz) and water

Blandmum Mon 29-May-06 09:16:50

for a picture of the magnet thing

SueW Mon 29-May-06 09:24:51

Clean some copper coins with salt and vinegar (always scares me what S&V on chips is doing to our teeth, this one!)

Put a copper coin into some vinegar in a small pot. Sprinkle a tiny pinch of salt into the vinegar. Voila - bright clean copper coin. MUCH quicker than cola. Once you've made the solution you can use it over and over.

chestnutty Mon 29-May-06 18:56:06

Soak an egg in vinegar for a couple of days. Then wash under the tap.
The shell will have dissolved and it will be held togeher by the membrane. if you hold it up to the light you can see the yolk.

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