CONSERVATION

OF Y. Energ or ole bo pete alle til. denot capaci orm work, or to over com ee When a ais mg mov, i& po e es a cer moving force Ton Coe tain te beoegt tora atendonl that moving force or energy is no annihilated, but transformed into th eneryy of heat by the action of the brake on tis rails. Jar caal bgt energy of steam; the steam der i it energy from coal; coal is a product c plant life, whose energy came from th sun. Each of these transformations form a link ia the chain of causes that enable the train to regain its energy of moti or There is always an apparent lo ¢ energy in whatever way it is applied but, though di ipated, it still exists in on or moro forms, and the aggregate of thes form a of energy romains unchanged In fact, conservation of energy mean thet the sum total of the —s of th universe is constant, and that all th proce es of naturo aro due to tram formations of energy from form to form as from motion to heat, from heat t chemical change, from chemical chang to heat again, and so on. [s. 107]