a body A capable of vibrating, is made to vibrate another vibrating body B, Astarts vibrating with the natural frequency of B. now the vibrations of Aare called forced vibrations. example;vibration...
On free vibration the beam or structure is not suffering influence of forces (Beam on space). In forced vibration the structure is under presence of force example bridges. Later on will you discover...
An individual mode is a particular frequency and phase (direction) of vibration. Spectral vibration is were you take a particular vibration time-wave form and view its individual frequency components...
a regular periodic variation in value about a mean a vibration is a movement up and down or side to side
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