Two identical masses attached to identical springs with spring constant 33 N/m are coupled by a spring with spring constant 1. The antisymmetric and symmetric normal modes have frequencies 15 Hz and 12 Hz.

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Free undamped vibrations

Whenever an object/system displaces in either side of its equilibrium position with the help of an external/internal means, then the object/system moves regularly or randomly on both sides of its equilibrium position. This motion is called vibration. Generally, there are three types of vibration: longitudinal vibration, transverse vibration, and torsional vibration.