🔍 Key Concepts

• Six degrees of freedom of ship motion (surge, sway, heave, roll, pitch, yaw) • Difference between motion along an axis (linear) and motion about an axis (rotational) • Definitions of longitudinal, transverse, and vertical axes on a vessel

💭 Think About

• First, identify which way the longitudinal axis runs on a vessel (bow to stern or side to side?). • Decide whether each answer choice describes linear motion (straight-line movement) or rotational motion (rocking/turning). • Match the type of motion (rocking side to side, nodding bow up/down, sliding sideways, etc.) with its proper technical term.

✅ Before You Answer

• Be sure you know which motions are rotations (not straight-line movements). • Confirm in your notes which ship motion corresponds to rotation about the ship’s length (bow‑to‑stern) axis. • Eliminate any terms that refer to motion along an axis rather than motion about an axis.