The Natural frequency of an oscillating system is the frequency of the system when there is no external force or forces acting on it.
Damping, Force Oscillation and Resonance
- Damping is the decrease of amplitude of an oscillating system.
- An oscillating system experiences damping when its energy is losing to the surrounding as heat energy.
- Usually, the frequency of the system remain unchanged.
|(Displacement-time graph of a damped oscillation)|
|(Amplitude-time graph of a damped oscillation)|
Type of Damping
Damping can be divided into:
- internal damping , where an oscillating system loses energy to overcome frictional force or air resistance that act on it.
- external damping , where an oscillating system loses energy due to the extension and compression of the molecules in the system.
- In a damped oscillation, external force must be applied to the system to enable the oscillation to go on continuously.
- Oscillation with the help of external force or forces is called a force oscillation.