The movement that describes a vessel deflecting side to side about its lengthwise axis is known as what?

The movement that describes a vessel deflecting side to side about its lengthwise axis is known as what?

• A. Roll
• B. Surge
• C. Sway
• D. Heave

Answer: (A)

Rolling is the motion described when a vessel tilts from side to side about its lengthwise axis (the bow-to-stern line). In this movement, one side of the hull rises while the other falls, like a ship tipping left or right. This is a rotation around the longitudinal axis, not a forward/back translation, not a vertical bounce, and not a side-to-side slide. That’s why the term matches the description of deflecting side to side about the lengthwise axis. Surge would be front-to-back movement, sway is side-to-side translation, and heave is vertical movement, none of which involve rotating about the ship’s lengthwise axis.

Rolling is the motion described when a vessel tilts from side to side about its lengthwise axis (the bow-to-stern line). In this movement, one side of the hull rises while the other falls, like a ship tipping left or right. This is a rotation around the longitudinal axis, not a forward/back translation, not a vertical bounce, and not a side-to-side slide. That’s why the term matches the description of deflecting side to side about the lengthwise axis. Surge would be front-to-back movement, sway is side-to-side translation, and heave is vertical movement, none of which involve rotating about the ship’s lengthwise axis.