If a vessel returns to upright after a disturbance due to an external force, what term describes its behavior?

If a vessel returns to upright after a disturbance due to an external force, what term describes its behavior?

• A. Stable
• B. Unstable
• C. Neutral
• D. List

Answer: (A)

Positive stability is the idea here: when a vessel is heeled by a disturbance and then returns to upright, it has a restoring tendency that brings it back to its vertical equilibrium. This happens because the weight and buoyancy forces create a righting moment as the hull heels, so once the external disturbance is removed, the forces act to return the vessel to vertical. If the vessel stayed at the new heel angle after the disturbance, that would be neutral stability. If the heel continued to increase, it would be unstable. A list is simply an ongoing tilt due to uneven weight or loading, not the property that causes a return to upright after a disturbance.

Positive stability is the idea here: when a vessel is heeled by a disturbance and then returns to upright, it has a restoring tendency that brings it back to its vertical equilibrium. This happens because the weight and buoyancy forces create a righting moment as the hull heels, so once the external disturbance is removed, the forces act to return the vessel to vertical.

If the vessel stayed at the new heel angle after the disturbance, that would be neutral stability. If the heel continued to increase, it would be unstable. A list is simply an ongoing tilt due to uneven weight or loading, not the property that causes a return to upright after a disturbance.