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 net, or total, force acting on the object is zero Newtons. This means one of two things. There could be no forces acting on the object. Or there could be several forces acting on the object, but they push against each other and cancel, and the result is as if no force is acting.'it will continue in its state of rest'. If it is standing still, it will continue to stand still.r there could be several forces acting on the object, but they push against each other and cancel, and the result is as if no force is acting. 'it will continue in its state of rest'. If it is standing still, it will continue to stand still.