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The tip of a probe dragged across a material is deformed by atomic-scale friction. The force needed relates to what?
AThe shear stress in the material
BThe boiling point of the material
CThe colour of the material used
DThe magnetic field of the probe
Answer & Solution
Correct answer: A. The shear stress in the material
1. A probe tip dragged across a material is deformed by friction at the atomic scale.
2. The force needed to drag it can be measured directly.
3. That force is found to be related to the shear stress in the material.
4. The variation in shear stress is enormous and hard to predict from theory alone.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section Making Connections: Submicroscopic Explanations of Friction_
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