i figured out where galileo went wrong on friction being independent of surface

[raaaid]

i call it the law of the 3 points of contact fro rigid objects

galileo, amonton and coulomb verified in practice it made no difference the necesary force to move a box on different size contact surface

well this is due to the law of the 3 point of contact

any rigid object will not be perfect bu wavy so there will be just 3 points of contact however much apparent surface

but this is false for soft objects as tyres in which the 3 points of contact law is not valid and the force to move the object is proportional to the contact surface