Forced Pendulums with Damping

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Watch the evolution of two sinusoidally forced pendulums with damping. The two pendulums follow the same equation of motion and are initially separated by an angular distance of 0.01. For what conditions does the system exhibit chaotic behavior?
Contributed by: Rob Morris (March 2011)
Open content licensed under CC BY-NC-SA
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"Forced Pendulums with Damping"
http://demonstrations.wolfram.com/ForcedPendulumsWithDamping/
Wolfram Demonstrations Project
Published: March 7 2011