🔍 Key Concepts

• Bank suction and cushion effects when a vessel moves close to a steep bank • How water flow and pressure differences around the hull affect bow and stern • Difference between the vessel being bodily moved versus yawing (swinging)

💭 Think About

• When water is squeezed between the hull and a steep bank, what happens to the water speed and pressure on that side of the vessel? • If one end of the ship is closer to the bank than the other, which end will feel a stronger sideways force, and in which direction will that end tend to move? • Is the more common effect that the whole ship slides sideways, or that the bow and stern move in opposite directions (twist)?

✅ Before You Answer

• Be clear on the meaning of bow vs stern motion: are you looking for twisting (yaw) or sideways sliding (set)? • Think about whether the hull is more likely to be attracted to or repelled from the bank on the side where water flow is restricted. • Eliminate choices that describe the entire vessel moving bodily in one direction if the usual effect is a pivoting or swinging motion.