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In Physics, vibration is defined as a mechanical oscillation or a rapid, periodic back-and-forth motion of an object about its position of equilibrium. It is a fundamental concept in mechanics and wave theory. Common examples include the movement of a guitar string after being plucked or the motion of a pendulum. Mechanical vibrations are the oscillations or repetitive motions of a mechanical system about an equilibrium position. Learn definition, types, & advantages and uses The periodic input can be a harmonic or a non-harmonic disturbance. Examples of these types of vibration include a washing machine shaking due to an imbalance, transportation vibration caused by an engine or uneven road, or the vibration of a building during an earthquake. Learn about the definition, terminology, and examples of vibration in elastic bodies. Find out the sources, effects, and methods to reduce vibration in machines and tools.