TractorTom....
Remember if you will the harrier jump jet ( this is the jet which can hover )
Imagine it hovering over the conveyor belt, at any time it can rotate its nozzles and shoot forward.
Now imagine it lowers its under carriage and lets its wheels touch the conveyor, so the wheels are now free wheeling, it will still shoot forward once the nozzles are rotated.
Remember jets thrust against air, not conveyor belts
Remember if you will the harrier jump jet ( this is the jet which can hover )
Imagine it hovering over the conveyor belt, at any time it can rotate its nozzles and shoot forward.
Now imagine it lowers its under carriage and lets its wheels touch the conveyor, so the wheels are now free wheeling, it will still shoot forward once the nozzles are rotated.
Remember jets thrust against air, not conveyor belts