Another thing I recall, ref inertia.
Take a small rowing boat in a heavy sea alongside another boat of the same size.
Both rise and fall together so jumping from one to the other is easy.
Then place a small boat against the ladder beside an aircraft carrier in the same heavy sea. The small boat is leaping up and down the ladder while the carrier stays relatively static, jump across at the wrong time and you will get very wet.
Don't ask how I know!!