…knelt on one knee, composed in the grate a pyre of crosslaid resintipped sticks and various coloured papers and irregular polygons of best Abram coal at twentyone shillings a ton from the yard of Messrs Flower and M’Donald of 14 D’Olier street, kindled it at three projecting points of paper with one ignited lucifer match, thereby releasing the potential energy contained in the fuel by allowing its carbon and hydrogen elements to enter into free union with the oxygen of the air.
There are no more uses of "potential energy" in the book.
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The pendulum repeatedly converts potential energy to kinetic energy and then back.
It’s not enough that we have to sit through class after class and try to stay awake while they fill our heads with all this stuff we will probably never need to know, like how to figure out the surface area of a cube or what the difference is between kinetic and potential energy.