what is the name of the force that slows the boat down

It depends. Friction slows boats down, as does putting engines in reverse.

the force which slowes boats down should be friction from what i was tought if it is not then i am trully and apsoulutly sorry but you should ask your teacher the currect answer if my answer is wrong. :)

Friction easy

But then again the engine but that isnt a force

fovumr zgauspf knqx teipkf pxcimf gyiejv pyhu

The force that slows down a boat is called drag. Drag is the resistance that opposes the motion of an object as it moves through a fluid, such as air or water. In the case of a boat, it specifically refers to the drag force exerted by the water. Would you like me to explain how to reduce drag and increase the boat's speed?