A lever is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum.
A boat...
It's a 2nd order lever. Water is pivot, boat is load, arm is effort.An oar is a lever
a second class lever
wheel and axle
oar
reegheh
it's pronounced "park" as in a nature park then "oar" as in a boat's oar.
oar
an oar or paddle
An Oar
oar
A scull boat; one oar to the stern.
A thole is a hole for the pin of an oar in a row boat, so a thole filler is an oar.