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Empirical measurements of the static friction
http://www.esperimentifisica.cloud/phisics_laboratory/static_friction/staticfriction.html
Static friction is friction between two or more solid objects that are not moving relative to each other. The coefficient of static friction, typically denoted as μs, is usually higher than the coefficient of kinetic friction.
The static friction force must be overcome by an applied force before the object is able to move.
The static coefficient of friction is measured on an inclined plane. This incline is
increased (slider h) until the brick begins to slide. At this point, the inclined plane is locked and the angle can be read.
The tangent of this angle is the coefficient of friction: μs=h/l
To fine tune, click on h slider:
use the arrow "=>" or "+" key for small increases of the parameter h
use the arrow "<=" or "-" key for small decreases of the parameter h
Repeat the experiment to find the minimum value of h for which the brick begins to
slide
Move the slider friction to set a new value of the static coefficient of the friction