Resonance can be a nuisance. How do you reduce the amplitude of oscillation or avoid resonance effect.
1. Add dampers to the system i.e increase damping
2. Alter natural frequency or driving frequency (if possible , depends on situation)
3. Reduce amplitude of driving force.
What can alter natural frequency of mass spring system? Change mass and spring constant.
What can alter natural frequency of a simple pendulum? Change the length of the string. Swing resemble simple pendulum.
