Physics is an experimental science. Physics has always been a discipline that has relied heavily on experiment. The first step of any research is to state a hypothesis, or educated guess. We put a huge number of people to work to study and build a spacecraft that is capable of landing on the moon, collecting a sample, and returning it to earth. How Energy manifests itself in each of these disciplines.
Mechanics is the study of the motion of bodies.
The fundamental laws of mechanics were put forth by Sir Isaac Newton in the late 1600's. Three centuries later, Newton's Laws of Motion are still used in physics and engineering. In physics, Energy is a quantity that can cause change. If you place a pot of cold water on a hot stove burner, eventually the water in the pot will get hot. We will see how a change in temperature of the water is related to the concept of energy transformation.