An object in motion has the ability to do work and thus can be said to have energy. The energy of motion is called kinetic anergy. We define the quantity of to be the translational kinetic energy (KE) work-energy principle: The net work done on a object is equal to the change in the object's kinetic energy. or Potential Energy (PE) is the energy associated with forces that depend on the position or configuration of a object relative to the surroundings. Types of Potential: Gravitational Potential Energy Chemical Potential Energy  Elastic Potential Energy Electrical (Electromagnetic) Potential Energy Nuclear Potential Energy