# per2 - Chapter 2 Forms of Energy Goals of Period 2 Section...

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21 Chapter 2: Forms of Energy Goals of Period 2 Section 2.1: To describe the forms of energy Section 2.2: To illustrate conversions from one form of energy to another Section 2.3: To define the efficiency of energy conversion processes Section 2.4: To describe energy storage Period 1 introduced energy in society and discussed some of the mathematical tools used in the World of Energy courses. Now we broaden our exploration of the World of Energy by describing various forms of energy, energy conversions from one form into another, and the efficiency of these conversions. The universe is made of matter and energy. While most of us have an intuitive sense of what matter is, the concept of energy is more difficult to grasp. Energy is most apparent when it is changing from one form into another. Period 2 class activities illustrate many types of these energy conversions. Energy is important because it provides the ability to do work. Work is done when one or more forces move an object over a distance. The objects being moved can be very small, such as molecules, atoms, electrons, or protons, or they can be much larger objects. When forces act on objects and do work, energy is converted from one form to another. In later periods we will learn how forces act on objects to do work. All forces can be related to one or more of the four fundamental forces of nature. As energy is converted from one form into another, the Law of Conservation of Energy requires that no energy can be lost. The total amount of energy put into a conversion process must equal the total amount of energy out. However, during each energy conversion some energy is converted into a form other than the form you desire. Energy converted into an undesirable form is called wasted energy. Many energy conversion processes require multiple steps, such as the steps involved when coal is converted into electrical energy. Each step in the process converts some energy into a form other than that needed for the next step. Because of this wasted energy, the amount of electrical energy obtained is less than the amount of energy in the coal burned to produce the electricity. The energy wasted at each step makes the overall process less efficient than the efficiency of any step. 2.1 Forms of Energy Although there are many ways to classify energy, we will discuss eleven forms of energy. The first three forms of energy are related to the energy of motion associated with moving objects, atoms, and molecules.

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22 Mechanical Energy of Motion : Moving objects exhibit mechanical energy of motion, also called kinetic energy. A ball thrown through the air or a car travelling down a road has mechanical energy of motion. Thermal Energy:
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per2 - Chapter 2 Forms of Energy Goals of Period 2 Section...

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