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This video displays normal modes in a vibrating system through the motion of air carts connected by springs on an air track. When this system is at resonant frequency, symmetrical patterns called normal modes appear. The normal modes are shown in both driven and undriven cases, and the demonstration is repeated for systems of two, three, and five coupled carts. The video includes a short explanation of the demonstration. <i>See Related Materials</i> for an interactive Java simulation that addresses the same concept. This resource is part of a video demonstration collection created by the Physics Department at MIT.

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