Kinetic energy in the wind and water.
Actually, it does both depending on how you use them. The sails can move so a person sailing a boat can catch the wind by how they move the sail or they can also stop the boat by the movement of a sail or lowering the sail.
Sail is a sheet of material used to propel a boat. - Or to move on the water in such a boat.
A sail
sail
Wind power
a force in the air pushing a sail to move a boat also know as wind
because you use a sail to move the boat
A little wind can move a boat depending on the size and weight of the boat.
uses an engine / motor (or a sail :)
A sail boat or yacht.
When a sailing boat is sailing into the wind the shape of the sail acts like a plane's wing and differential pressure across the sail propels the boat forward.