Static friction is the force that resists the initiation of sliding motion between two surfaces in contact. It acts parallel to the surface and opposite to the direction of potential movement.
5 Must Know Facts For Your Next Test
Static friction must be overcome for an object to start moving from rest.
The maximum static frictional force is proportional to the normal force and can be calculated using $f_s \leq \mu_s F_n$, where $\mu_s$ is the coefficient of static friction and $F_n$ is the normal force.
Static friction does not have a constant value but varies up to a maximum limit depending on the applied force.
If no external forces are applied, static friction can be zero even if there is contact between surfaces.
The coefficient of static friction ($\mu_s$) depends on the materials in contact and their surface conditions.