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 Dalian University of Technology Dalian University of Technology (DUT) (), colloquially known in Chinese as Dàgōng (大工), is a public research university located in Dalian (main campus) and Panjin in Liaoning, China. DUT, previously renowned as one of the Big Four Institutes of Technology, is among China's top universities for engineering and technology. It is a Chinese Ministry of Education Class A Double First Class University, and is also one of the national key universities administered directly under the Ministry of Education of China. Dalian University of Technology is located in Dalian (main campus) and Panjin in Liaoning. Founded in