<Dl> <Dd> 1 2 ∑ i m i v i 2 (\ displaystyle (\ frac (1) (2)) \ sum _ (i) m_ (i) v_ (i) ^ (2)) </Dd> </Dl> <Dd> 1 2 ∑ i m i v i 2 (\ displaystyle (\ frac (1) (2)) \ sum _ (i) m_ (i) v_ (i) ^ (2)) </Dd> <P> which can be understood as converting kinetic energy to work, was largely the result of Gaspard - Gustave Coriolis and Jean - Victor Poncelet over the period 1819--1839 . The former called the quantity quantité de travail (quantity of work) and the latter, travail mécanique (mechanical work), and both championed its use in engineering calculation . </P> <P> In a paper Über die Natur der Wärme (German "On the Nature of Heat / Warmth"), published in the Zeitschrift für Physik in 1837, Karl Friedrich Mohr gave one of the earliest general statements of the doctrine of the conservation of energy in the words: "besides the 54 known chemical elements there is in the physical world one agent only, and this is called Kraft (energy or work). It may appear, according to circumstances, as motion, chemical affinity, cohesion, electricity, light and magnetism; and from any one of these forms it can be transformed into any of the others ." </P>

What are the three laws of conservation of energy