An
oar is an implement used for water-borne
propulsion. Oars have a flat
blade at one end. Oarsmen grasp the oar at the other end. The difference between oars and
paddles are that paddles are held by the paddler, and are not connected with the vessel. Oars generally are connected to the vessel by means of
rowlocks or tholes which transmit the applied force to the boat. In this system (known as a second class lever) the water is the
fulcrum.