Hey Everyone, When I was reading about the apparent weight in an elevator I started to think about something. I think If two objects are in side contact moving at the same velocity, neither of them applies a force on the other, because it's as if they were at rest together. A force doesn't arise unless the further objects moves at a less velocity than the other. I guess this is true but I can't explain it to my myself in a proper way. I have the intuition for it but I'm not able to reach a neat explanation. Can it explained in terms of relative kinetic energy? I'm not sure.