Vocabulary
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Input - can be a movement or a change in environment that will set or begin a control process.

Control - force is applied to one component of a system, resulting in the movement of another component of the same system.

Output - can be a movement, sound, or light resulting from a system's operations.

Linear - movement in a straight line.

Reciprocating - movement backwards and forwards repeatedly in a straight line.

Oscillating - movement swinging backwards and forwards repeatedly through an arc path with the same central point.

Rotary - movement in a circular path.
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