... For most of every night, I exert a significant vertical force on my bed.
But my bed does not move.
... The same is true for the seat of my chair during dinner, and the ground under my feet when I stand or walk.
... When I am waiting for the bus, I almost always lean against the light pole,
exerting a considerable horizontal force against it. I have been doing this
for several years now, yet the light pole is still exactly where it has always stood.
