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.
A force is a push or a pull. Force gives an object the energy to move, stop moving, or change direction. It has both magnitude and a direction.Newton's first law states that an object's velocity cannot change unless it is acted upon by a force. force is a push or a pull. Force gives an object the energy to move, stop moving, or change direction. It has both magnitude and a direction.