What is Buoyancy? - Archimedes figured out that if the weight of the object being placed in the water is less that the weight of the water displaced, the object will float. This is known as buoyancy or the Archimedes principle. Learn buoyancy science, the reason why boats and ships float in water and don't sink, with our interactive article for kids. http://mocomi.com/buoyancy/

1. Buoyancy
Boats, canoes, ships, kayaks, and rafts all have
one thing in common- they are used as transport
on seas and rivers because they float. It's easy to
figure out without much thinking that if they are
made out of wood they will float, because wood
floats in water. But when you see a huge cargo
ship or a cruise-liner that looks like a floating
building, you can't help but wonder why this
massive chunk of metal doesn't sink.
Physics for Kids
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2. Buoyancy
A long time ago in Ancient Greece, a
mathematician named Archimedes was taking a
bath. When he got in, a certain amount of water
got displaced and overflowed over the lip of the
tub. This got him thinking so quick that he ran
through the streets without any clothes on
shouting Eureka! Eureka! Meaning I have found
it. Archimedes figured out that if the weight of
the object being placed in the water is less that
the weight of the water displaced, the object will
remain afloat. This is known as buoyancy or the
Archimedes principle.
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3. Buoyancy
Loadline
Ships made out of metal are able to remain
lighter than the amount of water they displace
because it is not a complete solid. The very
bottom of the ship, called the hull, is hollow and
therefore adds support to the ship without
adding any mass. When a ship is fully loaded,
there is a maximum amount of weight it can
carry before the weight of the ship increases
past the amount of water it displaces. If the ship
should take on some water by mistake during a
storm, it is simply pumped back out into the
ocean and it's safe from sinking once more.
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4. Project
Buoyancy
The next time you are in a swimming pool try
floating. Lay flat on your back and try to keep
afloat. You will notice that you are more buoyant
when you inhale than when you exhale. Can you
tell why?
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