đ Key Concepts
⢠Degrees of freedom of a vesselâs motion (surge, sway, heave, roll, pitch, yaw)
⢠Difference between motion along an axis (foreâandâaft, athwartships, vertical) and rotation about an axis
⢠Standard terminology for horizontal sideways motion versus turning motion
đ Think About
⢠First, sort the options into motions that are upâandâdown, forwardâandâaft, sideways, or rotational. Which ones are linear motions and which are rotations?
⢠Ask yourself: which term describes the ship sliding sideways to port or starboard without the bow swinging around?
⢠Eliminate any terms that clearly refer to vertical motion or to the bow swinging left and right about a vertical axis.
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Before You Answer
⢠Be clear which axis is foreâandâaft (longitudinal), which is athwartships (sideâtoâside), and which is vertical.
⢠Identify which listed motions are rotations about an axis (not the right choice here).
⢠Confirm which single term is defined as lateral (port/starboard) translation of the vesselâs center of gravity.