Question

3. What is the relationship among (a) magnitude of friction and the weight of the object, (b) friction
and nature of surfaces in contact with each other, (c) friction and the area of the surfaces in
contact with each other?
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Answer 1

Answer:

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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,

image0.png

to relate the two:

image1.png

Explanation:

. .. IT IS ABOVE....