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When a vessel is floating upright, there are two forces acting on it. The buoyancy force acts upwards and the gravity force acts donwards, cancelling each other. If a heeling force acts upon it (such as a wave hitting it), these forces are upset, and then a couple is formed. If the ship is loaded properly, a righting couple results, bringing the ship upright. If the center of gravity is too low, then an upsetting couple will result, capsizing (overturning) the ship.

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15y ago

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