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Elastic singularities such as crack tips, when in motion through a mediumthat is itself vibrating, are subject to forces orthogonal to the direction ofmotion and thus impossible to determine by energy considerations alone. Thisfact is used to propose a universal scenario, in which three dimensionality isessential, for the dynamic instability of fast cracks in thin brittlematerials.Comment: 8 pages Latex, 1 Postscript figur

Elastic Forces That Do No Work and the Dynamics of Fast Cracks