Some examples of mechanical energy are a hammer, a bowling ball, a drawn bow and arrow and a moving volleyball. Mechanical energy is defined as the energy an object has either due to its motion or its stored energy of position.
Mechanical energy can be either potential or kinetic. Potential energy, or PE, is the energy something has because of its position, instead of its actual motion. An example of something with potential energy is a coiled spring, a charged battery or a raised weight. There are two types of potential energy, gravitational and elastic. Gravitational is relates to the energy from an object in relation to its vertical position above the ground. Elastic energy refers to the object's energy from a stretched position.
Kinetic energy, or KE, is the energy of motion. Examples of things with kinetic energy are an airplane as it flies through the air, a baseball after it is thrown by the pitcher or a car driving down the road.
In order to find an object's total mechanical energy, or TME, the formula one uses is TME = PE + KE. However, since there are two types of potential energy, the formula can be expanded to TME = PEgrav + PEspring + KE.