What is the term for the motion of an object relative to a reference position involving a series of oscillations resulting in the displacement and acceleration of the object?

• A. Damping
• B. Motion
• C. Vibration
• D. Oscillation

Answer: (C)

Vibration refers to the repetitive back-and-forth motion of a body about a reference position, driven by a restoring force and producing displacement from equilibrium as well as corresponding accelerations during each cycle. This describes a series of oscillations where the object moves away from and returns toward the reference point, with speed changing as it passes through equilibrium. A mass on a spring is a classic example: the mass accelerates toward equilibrium, overshoots, and then reverses direction, repeating the cycle. While oscillation is the general back-and-forth motion, vibration specifically denotes this mechanical, energy-exchanging motion about an equilibrium position, often with damping affecting the amplitude over time.