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,
Legend of the Guardians: The Owls of Ga'Hoole "Legend of the Guardians" is the in-flight movie on the aircraft piloted by Carol (Matt Damon), who claims his passengers "... think that $300 and a photo ID gives them the right to fly through the air like the guardian owls of legend!" In a 2014 episode of "The Simpsons", "Specs and the City", Bart considers giving Nelson an "Owls of Ga'Hoole"-themed Valentine, finding it fitting that Nelson should get a Valentine referencing what Bart considers a bad movie. Legend of the Guardians: The Owls of Ga'Hoole Legend of the Guardians: The Owls of Ga'Hoole is a 2010 American-Australian 3D