If you are not observing some force over some distance then what, exactly, are you observing?
Constant motion doesn't require constant force.
observation requires the transmission of information to the observer, how is it being proposed to do this without force? The question on the table is "constructing a toy which demonstrates" and demonstration requires observation, I think is what is being said
For example, perfectly circular motion against no resistance requires no work since the force is always perpendicular to the motion.
he's saying you can't observe the phenomenon you are talking about without some additional work being done, which you might say is not part of the system, but it is part of the system that G*P proposed