hoe do weighing machines work

[oscarmurphy57]

[paddiez]

They weigh things and give you a reading, easy.

[Peter Pedant]

paddies answer is clever and not helpful
IN the absence of any other

spring in the bottom
makes us of Hookes law, length of compression directly proportional to the force - here mg the weight
Hookes law - ut tensio sic vis = as the tension so the force

and a ratchet to make length go round a part of a circle

I made this up
but you are running outof time
if the prep has to be in by Mon