unit 5 resonance
- Created by: megan
- Created on: 24-03-13 16:55
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- Oscillations
- Free and Forced Oscillations
- Releasing a pendulum and letting it swing freely is a free oscillation.
- Any oscillating system has a natural frequency
- By repeated application of force you could force the pendulum to oscillate at a different frequency
- This is a forced oscillation and the frequency you cause it to be is the driving frequency
- Forced oscillations involve adding energy to a system whilst it oscillates
- Unless this is done at the natural frequency, SHM will not take place and the system will dissipate energy quickly
- Damped oscillations
- Damped oscillations suffer a loss in energy in each oscillation which reduces the amplitude over time.
- a system performing SHM at its natural frequency may sill dissipate energy through a friction force
- The amount of damping will change how quickly the amplitude is reduced.
- Critical damping = the oscillator returns to is equilibrium position in the quickest time possible
- Resonance
- If a system is forced to vibrate at its natural frequency, it will adsorb more and more energy which increases the amplitude of the oscillation
- Some objects have several natural frequencies
- Damping systems are used to reduce resonance
- As the driving frequency applied to an oscillating system changes, it will pass through natural frequencies of the system which cause large amplitude vibrations
- Free and Forced Oscillations
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