🔍 Key Concepts
• Six degrees of freedom in ship motion (surge, sway, heave, roll, pitch, yaw)
• Difference between rotational motions and translational (side-to-side/fore-and-aft) motions
• Meaning of longitudinal axis versus transverse axis of a vessel
💭 Think About
• Which motions are rotations around one of the ship’s axes, and which are straight-line (linear) movements?
• If the motion is around the longitudinal axis (bow to stern), does the ship move up/down, side-to-side, or rotate from side to side?
• Match each choice to its standard definition in naval architecture: which one describes the ship rocking from side to side around its length?
✅ Before You Answer
• Identify which axis is the longitudinal axis (bow to stern) and which motion is a rotation about that axis
• Eliminate any options that are linear motions instead of rotational motions
• Confirm the standard list: surge, sway, heave (linear) vs. roll, pitch, yaw (rotational) and match accordingly