🔍 Key Concepts

• Metacentric height (GM) and how it relates to stability • Difference between a stiff vessel and a tender vessel • How GM size affects rolling period and angle of roll

💭 Think About

• Think about what happens to a ship’s rolling motion when GM is very large versus when GM is very small. • Which condition (large or small GM) is associated with slow, easy rolling compared to quick, snappy rolling? • Match each choice’s description (quick motion, stiff, large angles of roll, tender) with the type of rolling you would expect from a vessel with small GM.

✅ Before You Answer

• Be clear on the definitions of stiff vessel and tender vessel before choosing. • Consider whether small GM makes a vessel return to upright position quickly or slowly after being heeled. • Ask yourself: does a small GM usually produce small angles of roll or large angles of roll in a seaway?