"Energy methods are used in nearly every area of science and engineering. Changes in energy must be considered in the design of any device that moves, including ski lifts as well as skis. The concept of energy and conservation of energy originated in large part from the study of classical mechanics. A simple transformation of Newton's second law results in an equation that motivates the definitions of work, kinetic energy (energy due to an object's motion), and potential energy (energy due to an object's position). This equation relates the work done by external forces acting on an object to the change in magnitude of its velocity. This relationship can greatly simplify the solution of problems involving forces that depend on the object's position, such as gravitational forces or forces exerted by springs. In addition, studying the derivations and applications in this chapter will develop your intuition concerning energy and its transformations and give you insight into applications of these ideas in other fields." p139

ENERGY
THE ABILITY TO DO WORK. THE ENERGY OF THE UNIVERSE IS CONSERVED: ITS VALUE STAYS THE SAME OVER TIME.

FORCE
A PUSH OR A PULL

FORCE

INTERNAL
WITHIN A SYSTEM

INTERNAL FORCES
FORCES THAT ARE EXERTED BETWEEN PARTS OF THE SYSTEM

KINETIC
PERTAINING TO MOTION OR MOVEMENT

KINETIC ENERGY
ENERGY OF MOTION

POWER
THIS IS THE RATE OF USING ENERGY (ENERGY USED PER UNIT OF TIME). IT IS COMMONLY MEASURED IN WATTS AND HORSEPOWER.

WORK