The work-energy theorem states kf = ki + wall, where wall is the work done by all forces that act on the object, and ki and kf are the initial and final kinetic energies, respectively. the work-energy theorem states that a force acting on a particle as it moves over a changes the energy of the particle if the force has a component parallel to the motion. choose the best answer to fill in the blanks above: distance / potential distance / kinetic vertical displacement / potential none of the above to calculate the change in energy, you must know the force as a function of the work done by the force causes the energy change. choose the best answer to fill in the blank above: acceleration work distance potential energy to illustrate the work-energy concept, consider the case of a stone falling from xi to xf under the influence of gravity. using the work-energy concept, we say that work is done by the gravitational ,resulting in an increase of the energy of the stone. choose the best answer to fill in the blanks above: force / kinetic potential energy / potential force / potential potential energy / kinetic rather than ascribing the increased kinetic energy of the stone to the work of gravity, we now (when using potential energy rather than work-energy) say that the increased kinetic energy comes from the of the energy. choose the best answer to fill in the blanks above: work / potential force / kinetic this process happens in such a way that total mechanical energy, equal to the of the kinetic and potential energies, is choose the best answer to fill in the blanks above: sum / conserved sum / zero sum / not conserved difference / conserved