How i find friction between surfaces without using COF tester?

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    Friction Surfaces
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The angle of the book changed between sliding and the angle measurement.
The method can give a rough approximation of the coefficient of static friction, but it should be done more carefully.
 
Grat, you just (re)discovered the concept of "angle of friction".
Used in intro labs to estimate static and kinetic friction.
 
ya ...but this is just a illustration
thanks for comments
 
I will come back with come great videos ...