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Damping And ResonanceDamping And Resonance
DampingDamping
In any real oscillating system, the amplitude of the oscillations decreases in time until eventually stopping altogether
Effect is called dampingGenerally due to air resistance or internal
frictionEnergy dissipated to thermal energy over
time
Effects of DampingEffects of Damping
Damping does alter the frequency slightly, but not enough to matter in SHM equations
ResonanceResonance
Every vibrating system has its own natural frequency
If you try to vibrate the system at other than its natural frequency, it will bounce around but never reach any great amplitude
For example, if you push on a swing at random frequency
If you push on the object at the same frequency as its natural frequency, the amplitude will increase dramatically
This effect is called resonanceThe natural vibrating frequency of an
object is its resonant frequency
Breaking GlassBreaking Glass
Music note played at same frequency as the natural vibrating frequency of a crystal glass will cause a forced vibration of the crystal
If resulting vibration is great enough in amplitude that it exceeds the glass’s elastic limit, the glass shatters