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The forces of which I speak are illustrated here by the first boat, 1., at rest, and the second boat, 2.,  being swept by a passing swell.  The foredeck is labelled    AREA  A,  and below decks is labelled as  AREA   B.
A
B
1.
2.
TM
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Click here for an animated version of ocean swell effect on a boat
or here for a video of a ship in heavy surf