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Characteristics of Simple Harmonic Motion
 oscillating motion in which the acceleration is directly proportional to displacement from the midpoint and is always in the opposite direction to the displacement
 always a restoring force pull or push object towards the midpoint

Equations
 a =  (2 πf)2 s

Displacement Graph
 cosine wave
 maximum value is the amplitude
 velocity is the gradient

Velocity Graph
 acceleration is the gradient


Massspring System
 adding extra masses frequency is reduced (inertia increases)
 weaker springs/more joing together at ends frequency is reduced


Kinetic Energy and Potential Energy
 PE gravitational for pendulums, elastic for springs
 Towards midpoint: work done, PE transferred to KE
 Away from midpoint: KE transferred back to PE
 Midpoint: PE=0, KE is maximum
 Maximum displacement: KE=0, PE is maximum
 Total Energy=PE+KE

