Mechanical energy swing because of the work done by the pendulum to oppose these non-conservative forces. That the loss of mechanical energy in a system always resulted in an increase of the system's temperature has been known for a long time, but it was the amateur physicist James Prescott Joule who first experimentally demonstrated how a certain amount of work done against friction resulted in a definite quantity of heat which should be conceived as the random motions of the particles that comprise matter. This equivalence between mechanical energy and heat is especially important when considering colliding objects. In an elastic collision,
Dalian Maritime University Dalian Maritime University Dalian Maritime University () is a university located in Dalian, Liaoning, People's Republic of China. It is a key maritime institution under the Ministry of Transport of the People's Republic of China, and is a Chinese Ministry of Education Double First Class Discipline University, with Double First Class status in certain disciplines.Known as the "cradle of navigators", the university is the most famous maritime institution of higher learning in China and one of the few maritime institutions in the world "enjoying international reputation" recognized by the international maritime organization. The long history of the University can be