Scales, numbers, balance, mass, weight, inertia, equal and opposite reactions - it's confusing stuff. I could never get my head round those puzzles when you had to calculate the relative weights of various
pendulums and bars all interconnected.
Weight is all about gravity apparently. I recall watching TV footage of Dave Scott, an Apollo 15 astronaut, on the surface of the moon, dropping a feather and hammer
simultaneously, they dropped at the same rate, and landed together. Thats gravity for you, and lack of air resistance of course.
Where was I? Oh yes, pondering all this weight and numbers stuff. It does make one tinker with other possibilities,
if you are in a black hole and you drop that feather and hammer together, do they both end up
reappearing through a wormhole in the same place and same time? Or would it be the end of the universe and everything?
I could give myself a headache thinking about that. And don't get me started on turning forces, such as torque and moments, that really would be the end of me.