🔍 Key Concepts
• Axes of motion on a vessel: longitudinal (bow to stern), transverse (side to side), and vertical (keel to mast).
• The difference between rotational motions (angular movement) and linear motions (straight-line movement).
• Standard names for ship motions: surge, sway, heave, roll, pitch, yaw.
💭 Think About
• First, identify which axis is being described when the question says a horizontal line from bow to stern. Is that longitudinal, transverse, or vertical?
• Next, decide whether the motion asked about is rotation around that axis or movement along it.
• Then, match the type of motion (rotation vs straight-line movement) with the standard ship motion terms given in the choices.
✅ Before You Answer
• Confirm which ship motion term corresponds to rotation about the longitudinal axis (bow–stern line).
• Eliminate any options that describe motion along an axis rather than rotation around it.
• Double-check that the term you pick is associated with being angled from side to side versus nodding bow up and down.