Daniel Bernoulli
His first mathematical work was Exercitationes, which was published in 1724 with the help of Goldbach. Two years later, he showed for the first time the analysis of an object's motion into translational and rotational motion. Daniel Bernoulli's main work is the Hydrodynamique (Hydrodynamica) published in 1738, it was similar to Joseph Louis Lagrange's Mécanique Analytique. It classified the results into a single principle, the conservation of energy. Bernoulli also wrote a large number of different questions in the field of mechanics, especially problems connected with vibrating strings, and the solutions were given by Brook Taylor and Jean le Rond d'Alembert.