Incline with Sliding Blocks (1K20.35)
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Blocks with different surfaces are placed on an incline, which is slowly raised until the block just begins to slide down. The tangent of the angle at that point equals the coefficient of static friction between the inclined board and the sliding block.
The block pictured below has rubber on one side and Teflon on the other. Different blocks are available with different masses and surface materials.
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