Perpendicular - at an angle of 90° to a given line, plane, or surface or to the ground, System  - A system is a portion of the universe that has been chosen for studying the changes that take place within it in response to varying conditions., Energy - The ability to do work or cause change., Sound: - Vibrations that travel through the air or another medium and can be heard., Voltage - The electric potential difference between two points in a circuit., Wave: - A disturbance that transfers energy through a medium.,

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