Friction is Independent of Area of Contact

Physical Law

Let $B$ be a body resting on a rough surface $S$.

The friction between $B$ and $S$ does not depend on the area of contact between $B$ and $S$.

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): friction
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): friction