4.2 - Energy changes during SHM 4.3 - Forced Oscilliations and Resonance

4.2 - Energy changes during SHM 4.3 - Forced Oscilliations and Resonance

1. 4.2.1

   • Considering a swinging pendulum: at the maximum placement from O the pendulum has maximum potential enery and minimum kinetic energy. when the pendulum is at the equilibrium position, O, is has minimum potential energy and maximum kinetic energy

2. 4.3.1

   • Damping- When a system has to do work against opposing forces such as air resistance and friction it will lose energy and thus oscilliate less.
   • For example cars have dampers between the body and the wheels. Their purpose is to damp the oscilation caused by bumps in the road

3. 4.3.3

   • Natural frequency, f0 - the frequency by which a system would oscillate if not disturbed; when a pendulum is lift and released
   • Forced oscillation- when a system is forced to oscillate in a frequency other than its natural frequency

4. 4.3.5

   • Resonance- Forcing a system to vibrate at its antural frequency will increase its aplitude