What changes did you
observe in static
friction with change ir area of contact
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The force of friction comes from the surface characteristics of materials that come into contact. How does physics predict those characteristics theoretically? It doesn’t. Detailed knowledge of surfaces that come into contact is something people have to measure themselves (or they can check a table of information after someone else has done all the work).
What you measure is how the normal force (a force perpendicular to the surface an object is sliding on) relates to the friction force. It turns out that to a good degree of accuracy, the two forces are proportional, and you can use a constant,
Explanation:
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