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Chapter 2: Energy Conservation

Difficulty Level: At Grade Created by: CK-12
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The Big Idea

Energy is a measure of the amount of, or potential for, dynamical activity in something. The total amount of energy in the universe is constant. This symmetry is called a conservation law. Physicists have identified five conservation laws that govern our universe.

A group of things (we’ll use the word system) has a certain amount of energy. Energy can be added to a system: when chemical bonds in a burning log break, they release heat. A system can also lose energy: when a spacecraft “burns up” its energy of motion during re-entry, it releases energy and the surrounding atmosphere absorbs it in the form of heat. A closed system is one for which the energy is constant, or conserved. In this chapter, we will often consider closed systems; although the total amount of energy stays the same, it can transform from one kind to another. We will consider transfers of energy between systems –- known as work-– in more detail in Chapter 8.

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Date Created:
Feb 23, 2012
Last Modified:
Aug 10, 2015
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