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.
Measuring energy transfers. In physics, there is a standard way to work out how much energy has gone from one thing to another. It is to calculate the work done in a change. Work is done when an applied force causes something to move in the direction of the force.Î´E = work done = force x distance moved in the direction of the force.Notice that no energy goes in or out in these two situations: 1  when an object rests on a shelf â although the object has weight, there is no movement.2  if the force is perpendicular to the direction of movement-e.g. a satellite in orbit around the Earth.E = work done = force x distance moved in the direction of the force. Notice that no energy goes in or out in these two situations: 1  when an object rests on a shelf â although the object has weight, there is no movement.