Vibration
The 4 motions refer to the movements a robot can make: translation, rotation, oscillation, and vibration. Translation is moving in a straight line, rotation is spinning around an axis, oscillation is back and forth movement, and vibration is a rapid back-and-forth motion. These motions allow robots to perform a wide range of tasks and maneuvers.
Vibration
A vibration.
longitudinal vibration
That is called oscillation.
* Linear-travels in straight lines * Oscillating-back and forth around a point * Reciprocating-back and forth * Rotary-in a circle
The rapid back and forth of air or other matter is the sounds vibration (vibration is the anwser).
you can answer it yourself
Vibration is the rapid back and forth movement that creates sound. When an object vibrates, it creates waves in the air that are perceived as sound by our ears.
Linear back and forth motion at any speed is technically termed "Reciprocating Motion".
Work your fingers in deep, circular motions, going back and forth from the front to the back of the head.
The rapid movement of a particle back and forth is known as vibration. This movement typically occurs around an equilibrium point or position.