Standard Asset missing Physics Material

The only Physics Materials found in the standard asset package are Metal, Rubber and ZeroFriction. If you need a wood like one you'll need to create one yourself.

Rightclick in the project view and create a physics material. In the inspector, adjust the values until you're satisfied with the results.

Here are the original Bouncy, Ice, MaxFriction, Metal, Rubber, Wood, and ZeroFriction from Unity:

http://exninja.com/files/PhysicsMaterials_From_Standard_Assets.unitypackage