[Bob]

Perpetual motion machine:

Strap a piece of buttered toast to a cat's back and drop from a 5-story building.

Making that scheme work requires an expensive carpet underneath to attract the buttered toast. Dropping the cat from shoulder height should be sufficient. :=)

[twister881]

Hmmm...have always thought the buttered side is self-seeking, regardless of the surface.

The drop height is to allow the cat-toast combo to achieve terminal velocity, and then convert same to angular velocity at a height above ground level of ~8-10”.

8~)