What is the function of the pigment molecules in a light-harvesting complex in the thylakoid membranes?

The pigment molecules are present in the light harvesting complex of the thylakoid membranes which are responsible for the harvesting photons and for the transfer of light energy to the chlorophyll molecule which is present at the reaction center.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.