Center of Gravity - Center of Buoyancy
Stability - Center of gravity and center of buoyancy
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- Centre of Gravity is the point in a body where the gravitational force may be taken to act
- Centre of Buoyancy is the center of the gravity of the volume of water which a hull displaces
When the hull is upright the center of gravity and center of buoyancy is on the same vertical line.
- the hull is stable
For most hulls the center of buoyancy is below the center of gravity and the hull is said to be metastable.
When the hull tilts the center of gravity remains in the same position related to the hull (the hull is not changed and/or the cargo is not moved). The center of buoyancy moves to fit the new center of gravity of the volume of water replaced by the hull. At first the gravity force and the buoyancy force creates a
- righting torque
that tries to move the hull back to upright position. If the hull is tilted to much the center of buoyancy moves to a position where the buoyancy and gravitation force starts to create a moment that will
- capsize
the hull.
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Related Topics
- Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.
- Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects
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Related Documents
- Acceleration of Gravity and Newton's Second Law - Acceleration of gravity and Newton's Second Law - SI and Imperial units
- Buoyancy - The resultant force on a submerged body
- Center of Gravity - Center of gravity of some common bodies
