Introduction
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Macroscopic Friction
The law of Leonardo (da Vinci)
The law of Euler and Amontons
The law of Coulomb
Historical abstract
Asperities
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Friction Force Microscopy
Principle of measuring
Measuring Topology
Measuring Friction
Both Channels
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Tomlinson's mechanism
Phenomenology I
Phenomenology II
Mechanical adiabaticity
Distinguish positions
Playing Tomlinson
Friction - a pinning problem
2D Friction
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The law of Euler and Amontons

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A log of wood is sliding on a conveyer band. If double or triple the weight of the log friction is also doubled or tripled respectively.

This leads to the law of Euler und Amontons:

Friciton is proportional to the loading force
 
  The law of Leonardo (da Vinci)                  The law of Coulomb

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