Silly Putty, the classic toy that can stretch, bounce, snap, and mold, provides endless hours of amusement. It is an elastic liquid, so-called because it simultaneously exhibits both solid-like (elastic) and liquid-like (viscous) behaviors. The viscoelasticity of Silly Putty is evidenced by the way it bounces off a table like a rubber ball when interacting quickly with the surface and flows like a thick syrup when left alone for a long time. Is Silly Putty a solid or a liquid? The answer depends on the time scale over which it is observed. Typical viscoelastic materials are elastic at short times and viscous at long times.
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