The following simulation try to illustrate why the friction force does not depends on macro-scopic area.
However, it does depends on microscope contact area.
The multiplication of width(w) and height(h) are kept constant. w*h=A=constant.
When the width is educed, the height increase (so the pressure increase).
A new function has been added: you can drag spring to change the external force acting on the object.
I need feedback from you! Thank you in advance!
Click the eye (image) to display the simulation