Energy, Damping and Resonance in SHM
4.2.1 Know the interchange between KE and PE during SHM. Consider a spring 4.2.2 KE = 0.5mw^{2}(x_{0}^{2}  x^{2}) TotalEnergy = 0.5mw^{2}(x_{0}^{2}) PE = 0.5mw^{2}(x^{2}) x_{0} = A (amplitude)... v = +/w[sqrt(x_{0}^{2}  x^{2})]
4.3.1 Damping: a force that is always in the opposite direction of motion of the oscillating particle and the force is a dissipative force. Applet. 4.3.2 Underdamping: small force oscillation that slows down until it stops. Criticaldamping: system returns to equilibrium without oscillations Overdamping: system returns to equilibrium but slower than critical damping. 4.3.3 Read pages 2089. Natural frequency and forced oscillations. 4.3.5 Resonance: state at which an externally applied force = natural frequency providing large amplitude. More information. Tacoma Bridge HW. PG 213: 1517, 24, 26, 27, 2932, 3537. 
