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Friday, November 9, 2007

It's Sink or Swim!

We've had car trouble the last two days. As in the one car we have went dead on us. So, I didn't get much done in the way of schoolwork the last two days. Good thing Lillie's only four and not technically school age yet. So, today, I wanted to do a little science which is something we do little of, sad to say. So, I thought we'd do an experiment from my Usborne Pocket Scientist 2 book. It is internet linked which means that Usborne has a site that gives you links related to the content of certain pages in the book. If you're not familiar with Usborne books they are wonderful!
Our experiment was to have Lillie predict ,out of some selected items, which would float and which would sink. Then, she dropped them into a pan of water to see if she was right. I explained in simplest terms why things float and sink. See, it's called the Archimedes principle which states that a body immersed in a fluid is buoyed up (pushed up) by a force equal to the weight of the displaced fluid.
Just kidding. I didn't say it like that. If I had Lillie would've been like this...

Basically, an object floats if it is lighter than the liquid that is pushed back when the object is put into it. By the way, Archimedes is the dude in the picture above. Legend has it he discovered the principle of buoyancy while taking a bath. See, kids, cleanliness and personal hygiene really does pay off! Here's the pictures of this experiment.

Next, I sat three different size containers out. We counted how many pennnies we could put in each one before they sank.
First Container:9 pennies 2nd:96! 3rd: 76 pennies.

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