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# Define coefficient of static friction.

Last updated date: 12th Aug 2024
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Hint: In physics, Friction is a type of relative force that acts as resistance between two bodies that are in contact with each other. Or we can simply say that, when two bodies are in contact with each other there exists a contact force which opposes their relative motion.

We also need to know about Normal Reaction force: A normal reaction force acts on a body when a body is in contact with the surface and it’s always perpendicular to the contact surface which is balanced by force of gravity and it’s denoted by $N$.
And the definition of coefficient of static friction states that “It’s the maximum ratio of applied force to the normal force acting on a body when no motion of the body takes place”. It’s denoted by ${\mu _s}$ and it’s given by,
${\mu _s} = \dfrac{{{{\vec F}_s}}}{{{{\vec F}_N}}}$
Where, ${\vec F_s}$ is the applied force on the body and ${\vec F_N}$ is the normal force acting on the body.