Hello I had a debate on comparing walking on the ground with velocity V and wlaking on an electrical walker with the same velocity V. My claim is that there is no difference between walking on the ground in velocity V and walking on an electrical walker with the same velocity V, in terms of the forces that the person muscles do. To further "proof" it, I brought an example of escalator. I said that going up 10 stairs on the escalator requires the same effort as going up the same 10 stairs on the escalator if it hasnt moved at all. What do you think? Thanks in advance.