Public School, Deer Creek Minnesota, 1918 LakesnWoods.com Postcard and Postcard Image Collection - click image to enlarge Aerial view, Deer Creek Minnesota, 1972
Whenever work is done upon an object by an external force, there will be a change in the total mechanical energy of the object. If only internal forces are doing work (no work done by external forces), there is no change in total mechanical energy; the total mechanical energy is said to be conserved.
The total mechanical energy of a system, at any one instant, is either all kinetic or all potential energy. The total mechanical energy of a system is constant only if nonconservative forces act. The total mechanical energy of a system... show more Which of the following statements is/are true?