sphere sitting in a tube - rotate tube, cause sphere to rotate on its z axis?

I have a sphere sitting in a tube
The sphere has a rigid body and sphere collider
The tube has a rigid body and mesh collider

When I rotate the tube on its z, I need this to cause the sphere to rotate on its z. Right now, the sphere just sits there motionless as the tube its sitting on merrily rotates on its z axis.

Is there something within Unity I can use to achieve this naturally using Physics?

 

You could parent one to the other. Or you could connect them with a Joint.

Just remember my motto: when you work with PhysX, be prepared for much wailing and gnashing of teeth.

 

thanks! I'll try those suggestions. Might try and hack it to by adding torque to the sphere on its z axis when in collision with the tube