Partical motion is the answer
Because of the waves.
You've apparently never noticed waves.
Buoys float on the water. Waves are water moving. The moving water moves the floating buoy.
The word buoy can be a noun or a verb.noun -- The buoy marks the entrance to the channel.verb -- The life jacket buoyed him up. - past tense..
The buoy moves up and down as the water passes beneath it.
Buoys have been designed to operate using the motion of waves to dirve a generator within the buoy. The up and down action causes a plunger to move within an armature and thus producing current
A cable buoy is an empty cask employed to buoy up a cable in rocky anchorage.
Bob
BOB BOB BOB
In England, Bob means abbreviation of Robert. In Germany, Bob means famous, bright fame. Bob can also mean to move up and down; the flaot bobs on the water
Poor Bob doesn't do much strumming these days but when he was alive he was a down, down up down up up kinda guy. Sorry, I just couldn't help myself.
Bob
bob
bob