🔍 Key Concepts
• Ship motions: know the six basic motions (surge, sway, heave, roll, pitch, yaw)
• Axes of rotation: longitudinal (bow–stern), transverse (port–starboard), vertical (up–down)
• Relationship between each motion and its corresponding axis (e.g., roll vs pitch vs yaw)
💭 Think About
• First, recall which motion is the "nodding" up‑and‑down of the bow and stern in a seaway—what is that called?
• Then ask: for that motion, is the ship rotating around a line running bow‑to‑stern, side‑to‑side, or straight up‑and‑down?
• Match each of the three rotational motions (roll, pitch, yaw) to longitudinal, transverse, and vertical axes, and see which axis lines up with pitching.
✅ Before You Answer
• Be clear on the difference between rotation (roll/pitch/yaw) and translation (surge/sway/heave)
• Visualize a line (axis) drawn through the ship for each option and imagine the pitching motion around it
• Confirm which axis runs from bow to stern and which runs from port to starboard before choosing.