Heave involves movement along which axis?

Heave involves movement along which axis?

• A. Diagonal axis
• B. Horizontal axis
• C. Vertical axis
• D. Rotational axis

Answer: (C)

Movement along the vertical axis means up and down motion. Heave is the vertical translation of a vessel, one of the six degrees of freedom that describe how a ship moves in waves. The vertical axis runs top to bottom, so any motion that goes up or down corresponds to heave. This is distinct from rotational motions like roll, pitch, or yaw, and from horizontal translations such as forward/back (surge) or side-to-side (sway). So the best answer is vertical axis because heave specifically refers to vertical, not horizontal or rotational movement.

Movement along the vertical axis means up and down motion. Heave is the vertical translation of a vessel, one of the six degrees of freedom that describe how a ship moves in waves. The vertical axis runs top to bottom, so any motion that goes up or down corresponds to heave. This is distinct from rotational motions like roll, pitch, or yaw, and from horizontal translations such as forward/back (surge) or side-to-side (sway). So the best answer is vertical axis because heave specifically refers to vertical, not horizontal or rotational movement.