Soft/Rigid Bodies >
Set Active Key
Sets an active key for the soft or rigid body. Setting an active key sets the Active attribute to the on setting and keys the object’s current Translate and Rotate attribute values.
At a subsequent frame, you can switch control from dynamics to Translate and Rotate keys by selecting Soft/Rigid Bodies > Set Passive Key. See Soft/Rigid Bodies > Set Passive Key.
For more information, see Combine rigid body dynamics and keys.