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Why does it float?

by Dan Monahan

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Why Does it Float?
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I really want to figure out what makes an object sink or float.
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Thats easy - if something is light, it floats.
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But why does a big ship float? it is really heavy.  It has a really big mass.
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Hmmm, that is a good example, but maybe it is also because it is really big.
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You mean that it has a large volume? it takes up a lot of space?
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Exactly.  If it is really big, has a big volume, then it will float.
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But what about a huge rock?  it is also really big, but it sinks.  Also, sometimes big boats sink.
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You keep coming up with these really good ideas.  Maybe it is because there is air inside a big ship - there is no air inside a rock.
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Now you are having some good ideas.  It sure is complicated..
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Yeah, it seemed really easy, but now that we talk about it I am not so sure.  Lets do some experiments.
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