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Key Terms
System
The object or group of objects we're ___ on.
Environment
Everything ___ the defined system.
Internal Forces
Forces between objects ___ your system; they do not affect the system's overall motion.
External Forces
Forces acting on your system from the environment; these are the only ones that can ___ the system's overall motion.
Free-Body Diagram (FBD)
A simple diagram showing *all* the ___ forces acting *on* a single object or system, represented as vectors from a single point.
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