Posted 7th-March-2009 at 04:14 PM by gina (President Obama 's energy bill)
There are many types of energy like kinetic, potential, gravitational, thermal and others. Energy can be transferred from one form to another. For a very simple example, a stationary ball on top of a table (potential energy) falls from the side of the table (gravitational and kinetic energy). In this case, the potential energy converted into kinetic and gravitational energy. But, in essence, the total energy of the system for the ball remained the same.
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