The two primary factors that increase a ship's frictional resistance as it moves through water are its wetted surface area and its speed. Frictional resistance is the drag force created by the friction between the ship's hull and the water, primarily due to the water's viscosity, which causes shear stresses as water layers slide past each other.
Firstly, the wetted surface area is the total external surface area of the ship's hull that is submerged in the water. A large....
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