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
Monday, March 8, 2010
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