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 University of Technology the "Double First-Rate", "985 project", "211 project" and the "E9 Group" of China. During the last Chinese disciplines assessment in 2017, disciplines including engineering, natural sciences, management, economics, et al ranks highly among Chinese top universities. DUT's business education institutions are accredited by AACSB, CAMEA and EQUIS, one of eight Universities in China. Previously known as Dalian University, DUT was founded in 1949. In July 1950, the School of Engineering separated from Dalian University and became Dalian Institute of Technology (大连工学院, DIT). Due to the rearrangement of the Ministry of Education to enhance development of education and construction of new