<meta http-equiv="refresh" content="1; url=/nojavascript/"> Energy Conservation | CK-12 Foundation
Dismiss
Skip Navigation

Chapter 2: Energy Conservation

Created by: CK-12
 0  0  0

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.

Chapter Outline

Chapter Summary

Image Attributions

Description

Subjects:

Grades:

Date Created:

Feb 23, 2012

Last Modified:

Sep 15, 2014
You can only attach files to None which belong to you
If you would like to associate files with this None, please make a copy first.
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original
 
CK.SCI.ENG.SE.1.Physics-People's-Physics-(Video).2

Original text