Determine the maximum static friction force that can act before an object begins to slide, from the coefficient of static friction and the normal force.
物体即将滑动时的静摩擦力上限。
| Item | Formula | Source / Standard |
|---|---|---|
| Max static | f_s,max = μ_s · N | Coulomb law |
| Threshold | Exceed → slide | static limit |
| Coefficient | μ_s surface-dep. | friction table |
Constants used on this page and their authoritative sources, for verification and citation
| Constant | Value | Unit | Source |
|---|---|---|---|
| Standard acceleration of gravity g_n | 9.80665 | m·s⁻² | ISO 80000-3 / BIPM conventional value (exact) |
Note: the static friction coefficient μ_s is an empirical property of the material pair and surface condition — there is no authoritative constant to cite; use measured or tabulated values (this page uses common engineering values).