A virtual displacement in classical mechanics represents an infinitesimal instantaneous change in system coordinates consistent with constraints.
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SUPPORTED
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In classical mechanics, a virtual displacement is defined as an infinitesimal, instantaneous change in system coordinates that adheres to the system's active constraints.
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Wikipedia: Virtual displacement
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en.wikipedia.org: Virtual displacement
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States virtual displacement shows how a trajectory can deviate without violating constraints.
britannica.com: Virtual displacement | physics
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Defines virtual displacement as an instantaneous change in coordinates consistent with constraints.