Questions and Answers
What defines the center of gravity (CG) in a floating object?
Which term describes the permanent tilting of a ship due to uneven weight distribution?
What is the role of the metacenter (M) in ship stability?
What is a characteristic of stable equilibrium in a ship?
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Which of the following is true regarding loaded displacement?
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How does density affect buoyancy in fresh and seawater?
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What does the term 'deadweight' refer to on a ship?
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What describes the vertical center of gravity (CG) in relation to a ship's stability?
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Study Notes
Stability Terminologies
- Stability: The capacity of a ship to resist capsizing under external forces.
- Center of Gravity (CG): The single point where the weight of an object is uniformly distributed.
- Center of Buoyancy (CB): The centroid of the submerged volume; the point through which buoyant force acts.
- Vertical CG: CG's position relative to the waterline; affects stability.
- Longitudinal CG: CG's position from the front to the back of the ship.
- Transverse CG: CG's position from one side of the ship to the other.
- Heeling: The tilting motion of a ship caused by external forces, such as wind or waves.
- Listing: A permanent tilt resulting from uneven weight distribution onboard.
- Stability Moment/Righting Moment: The force that assists a heeled ship in returning to a vertical position.
- Stable Equilibrium: Condition where the ship naturally returns to an upright position after tilting.
- Neutral Equilibrium: Condition where the ship retains its position after tilting without returning to upright.
- Unstable Equilibrium: Condition where the ship continues to tilt away from its original position once disturbed.
- Righting Lever (GZ): The distance between CG and CB when the ship is heeled, crucial for calculating stability.
- Metacenter (M): The point where vertical lines intersect through successive positions of CB, essential for determining the stability of a floating vessel.
- Weight Displacement: The equivalent weight of water that is displaced by a floating object, indicating buoyancy.
- Density of Fresh Water (FW): Mass of one unit volume, used as a reference for specific gravity measurements.
- Density of Sea Water (SW): Mass of one unit volume of seawater, typically higher than that of fresh water.
- Specific Gravity of FW: Ratio comparing the density of a substance to that of fresh water.
- Specific Gravity of SW: Ratio comparing the density of a substance to that of seawater.
- Lightship: A vessel with no cargo, fuel, or passengers aboard; its baseline weight.
- Loaded Displacement: The total weight of the ship when loaded, including cargo and provisions.
- Deadweight: The maximum weight that a ship can safely carry, including cargo, fuel, water, and provisions.
- Payload: Weight accounted for by passengers and cargo the ship is transporting.
- Gross Tonnage: The total internal volume of a ship, a measure of its carrying capacity.
- Net Tonnage: The volume of cargo space available on the ship for cargo transportation.
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Description
This quiz explores essential terminology related to ship stability, including key concepts such as center of gravity, heeling, and types of equilibrium. Understanding these terms is crucial for anyone studying naval architecture or maritime safety. Test your knowledge and ensure you're familiar with the language of stability at sea.
