How a Ship Floats and Rights Itself (Buoyancy and Restoring Force)
How a ship floats and comes back upright
1:04 · 720p · With AI narration and captions. This sample was made with the same system as this service.
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Buoyancy and Stability
Let's see how a ship floats on water, and how it comes back upright when it tilts.
Archimedes' Principle
An object in water receives a buoyant force equal to the weight of the water it pushes aside. A ship floats where buoyancy and weight balance.
Why an Iron Ship Floats
A lump of iron sinks, but the same weight of iron, shaped into a hollow ship, pushes aside lots of water and floats.
The Force That Rights It
Weight acts at the center of gravity, and buoyancy at the center of buoyancy. When the ship tilts, the center of buoyancy moves to the lower side, and the two forces turn the ship back upright. This is the restoring force.
Top-Heavy Is Risky
If cargo is piled high and the center of gravity is too high, the two forces tip the ship further, and it may capsize.
Lower the Center of Gravity
So ballast water is put in the bottom of the ship to lower the center of gravity, making it easier to come back upright after tilting.
Floats and Rights Itself
A ship floats by buoyancy, and comes back upright by the restoring force from its centers of gravity and buoyancy.
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