Coefficient of Kinetic Friction is usually Less than Coefficient of Static Friction
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Physical Law
Let $B$ be a body resting on a rough surface $S$.
Let $\mu_k$ and $\mu_s$ denote the coefficient of kinetic fiction and coefficient of static fiction between $B$ and $S$ respectively.
Then it is typically the case that $\mu_k < \mu_s$.
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