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 overall force acting on an object when all the forces are combined is called net force. - Balanced forces means that the velocity of the object is staying constant, even if it is a 0m/s. They have no effect. - If you have two forces in the same direction, the forces can be added.