A wooden log with one end heavily weighted floats vertically in the water with a portion of its length protruding above the surface. A ring is painted around the log at the water line. The force (F) required to hold the log vertically above or below its equilibrium position is directly proportional to the displacement (y) of the ring from the water surface. A force of 120 newtons is required to hold the ring 0.03 meter above the water. The mass of the log is 1000 kg.