Vibration is the rapid back-and-forth movement of physical particles, as a reaction to different forces. In class 8 science, vibration is defined as a repeated back and forth motion. When an object moves back and forth continuously, it is said to be making vibration or oscillation. The amplitude, frequency, and time period of vibration are important characteristics used to describe oscillations. The amplitude of vibration is the maximum displacement of the vibrating object from its mean position. The frequency of vibration is the number of vibrations or oscillations made in one second. The time period of vibration is the time taken by the vibrating object to complete one vibration or one oscillation.