This lesson explains how energy can be transferred from one form to another, but is always conserved. It is 4 of 4 in the series titled "Conservation of Energy."

This lesson presents the features that are common among all forms of living things. It is 2 of 4 in the series titled "Common Features of All Forms of Life."

Learn about the definition of energy, the forms that it comes in, and the difference between renewable and nonrenewable sources.

This lesson will explain the advantages and disadvantages of generating electricity from various forms of energy. It is 3 of 4 in the series titled "Energy Forms."

This lesson will explain the advantages and disadvantages of generating electricity from various forms of energy. It is 4 of 4 in the series titled "Energy Forms."

Watch molecules collide with enough energy that bonds break and form new bonds in a chemical reaction.

This site from the Georgia State University provides an interesting chart form of the ideas of relativity. Column 1 - Idea, Column 2 - Experiment. Each item is linked to its own page of explanation, which is well done. A nice type of...

This lesson introduces the process of active transport, explaining that it is a form of transport that requires energy, and moves molecules against their concentration gradient. It is 4 of 4 in the series titled "Active Transport."

This lesson introduces the process of active transport, explaining that it is a form of transport that requires energy, and moves molecules against their concentration gradient. It is 1 of 4 in the series titled "Active Transport."

This lesson introduces the process of passive transport, explaining that it is a form of transport that does not require energy, and moves molecules down their concentration gradient. It is 4 of 4 in the series titled "Passive Transport."

This lesson introduces the process of passive transport, explaining that it is a form of transport that does not require energy, and moves molecules down their concentration gradient. It is 1 of 4 in the series titled "Passive Transport."