Monday, March 8, 2010

Energy

time to go back to the time machine, which i've inconspicuously hidden inside my DeLorean.

I'm going to go back and talk to myself about identifying systems.

A system is the object or objects that you are focusing on, but not the object that is exerting a force, because an system cannot exert force on itself. A system has to include the earth, and sometimes the surface if you are dealing with thermal energy


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