Energy is the ability of an object to do work. Two types of energy include potential and kinetic energy. Potential energy is the stored energy in a system due to its position. For example, imagine you are an archer and you have pulled the bow back getting ready to shoot at your bullseye. When the bow is pulled back it has potential energy. Energy is stored in the string and has potential to launch the arrow forward when you let go of it. Kinetic energy is the energy of motion. Moving things have kinetic energy. An example of kinetic energy would be the arrow flying through the air when you release the string on the bow. Energy can be transferred from one type to another. Potential energy can be transferred into kinetic energy as in the bow and arrow example and vis versa.