Spark image

Boat on the sea

As the waves move past they transfer energy to the boat which bobs up and down with the same frequency as the waves. It moves in a vertical direction only. However if the waves have been made by the wind the particles of water will also move in the horizontal direction making their motion as a whole circular. In this case the boat would move along with the waves.

 
 
 
© Keith Gibbs/John Bourne 2008