Final answer:
Boats with planing hulls perform like displacement hulls at low speeds but as they gain speed, they rise up and glide over the water's surface due to hydrodynamic lift.
Step-by-step explanation:
Boats with planing hulls may operate like displacement hulls when at rest or at slow speeds but will rise up and glide on top of the water as they move faster. Unlike displacement hulls that plow through the water regardless of speed, planing hulls are designed to lift out of the water at high speeds due to hydrodynamic lift. This transition from operating as a displacement hull at slow speeds to a planing one at higher speeds allows the boat to move with less friction over the water's surface, resulting in higher speeds and more efficient travel.
Boats with planing hulls may operate like displacement hulls when at rest or slow speeds. However, as they move faster, they transition into a planing mode. In planing mode, the boat rises up on top of the water rather than moving through it, reducing drag and allowing for higher speeds.