🔍 Key Concepts

• Effect of raising the ship’s center of gravity (KG) on stability • Relationship between GM (metacentric height) and righting moments • Difference between KM, KG, and GM and which ones change when weight is moved vertically

💭 Think About

• When weight is shifted upward, does the ship’s overall center of gravity move up or down? How does that affect GM? • If GM becomes smaller or larger, what happens to the size of the righting arm (GZ) and thus the righting moment? • Which of the listed options are directly affected by moving weight vertically, and which are properties of the hull form that normally stay constant for a given displacement?

✅ Before You Answer

• Verify that KM is primarily a hydrostatic property of the hull at a given draft, not normally changed by moving internal weights • Recall that KG increases when weight is shifted upward and decreases when weight is shifted downward • Connect a smaller GM with weaker righting ability and consider which choice best reflects that effect