🔍 Key Concepts

• Longitudinal center of gravity (LCG) definition in stability work • Relationship between moment, force (weight), and distance • How naval architects calculate centers of gravity: LCG = (sum of longitudinal moments) / displacement

💭 Think About

• Ask yourself: to get a center (a distance), do we normally divide a total weight or displacement into a simple length, or into a total moment (weight × distance)? • Which choice refers to a sum of moments along the ship’s length, and which choices are just single distances or unrelated quantities? • Think about typical stability tables: what columns do you usually see summed to find a new LCG after loading or discharging weights?

✅ Before You Answer

• Identify which option mentions moments specifically, not just a distance or baseline • Recall that moment = weight × distance and displacement is the total weight of the vessel • Confirm that dividing total longitudinal moment by total displacement will give a distance forward or aft of a reference point (the LCG)