How i find friction between surfaces without using COF tester?

ParamTv

In the morning i get this idea ....the simplest way to determine friction force between two sliding surfaces.
http://www.youtube.com/watch?v=T2jWT9r2Z-U&feature=plcp

mfb

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.

nasu

Grat, you just (re)discovered the concept of "angle of friction".
Used in intro labs to estimate static and kinetic friction.

ParamTv

ya ...but this is just a illustration
thanks for comments

ParamTv

I will come back with come great videos ...