Another "i cant find this simple bearing" one

[julianf]

I don't know why everything needs to be such a dick fest -

 

[Turbo]

So if a plane is going down the runway to take off, but the runway is actually a belt being driven in the opposite direction, speed matched to exactly match the acceleration of the plane, are the wheel bearings rotating at normal speed, twice speed, or not moving at all?

Don't start!

I'm trying to remember that thread. How long ago was it?
It was one of the classic ones, like the more recent 'get the surface table out of the van' one.

 

[bricol]

If a router is running at full synchronous speed, but being pushed backwards, is . .