The Rigid Body constraint is the only constraint that has a Setup pane . To access it, create a Rigid Body constraint and click the Setup tab in the Constraint settings.
Rigid Body Setup pane
There are two fields found in the Rigid Body Setup pane:
These fields let you damp (or slow) the speed at which the constrained object rotates and translates with its sources. Use them to create delays or to smooth jerky movements in animation created by constraints.
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