Elements of Mechanical Engineering

- The question “What is energy?” is difficult to answer in a simple, intuitive way, although energy can be rigorously defined in theoretical physics.

- In the words of Richard Phillips Feynman, “It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount.

- However, energy is the capacity of a physical system to do the work. It comes in many forms, such as kinetic energy, potential energy and many others. It is denoted by E and measured in N-m.

- Energy resources are indispensable for any companionship, be it one dependent on subsistence farming or an industrialized area. A resource is a source or supply from which benefit is realized.

- There are many different sources of energy, some well-known such as coal or petroleum, other less so, such as tides or the heat inside the earth.

- Understanding energy resources involve considering all types of energy source from various scientific and technological perspectives, with a focus on the uses, limitations and implications of usi...