How i find friction between surfaces without using COF tester?

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The discussion explores a method for estimating friction force between two sliding surfaces without using a coefficient of friction (COF) tester. A video link demonstrates how the angle of a book changes during sliding, which can provide a rough approximation of the coefficient of static friction. Participants note that this approach illustrates the concept of "angle of friction," commonly used in introductory labs for estimating static and kinetic friction. The method requires careful execution for accurate results. The original poster plans to share more videos on the topic in the future.
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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 ...
 
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