The summary in Example 4 is from this article at Physlink.com. The following illustration shows an example of "tacking," with the boat sailing from left to right, into the wind.

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Sample answer:

The sailboat's weight pulls the ship downward and the sailboat's buoyancy pushes the ship upward with equal force. If the sailboat is tilted, the center of buoyancy will move sideways and the buoyant force will push upward to return the ship to its original position.