**Static Friction Formula**

Let us imagine a car at rest. To start it without making use of the accelerator, one will have to use a lot of force.

This is static friction! Here the object at rest is made to move conflicting the frictional force.

**Static friction is the resistive force perceived in a body which is at rest. It is articulated as**

Where,

static friction is F_{s} ,

the coefficient of static friction is μs and

the normal force is F_{n}

**Static Friction Formula** helps one to compute the frictional force, co-efficient of friction or normal force in any asked numerical.

**Static Friction Solved Examples**

Underneath are numerical on static friction which helps to comprehend where one can use this formula:

**Problem 1: **A force of 200 N is exerted on a snacks box of 5kg still on the floor. If the coefficient of friction is 0.3, calculate the static friction?

**Answer:**

Known:

Fn (Normal force) = 200 N,

μs (Coefficient of friction) = 0.3,

Static friction is given by F_{s} = μs F_{n
}= 0.3 × 200 N

= 60 N.

**Problem 2: **Amy is hauling a toy car of mass 4 kg which was at rest earlier on the floor. If 50 N is the value of the static frictional force, calculate the friction coefficient?

**Answer:**

Known:

m (Mass) = 4 kg,

F_{s} (static frictional force) = 50 N,

F_{n} (Normal force) = mg

= 5 Kg × 9.8 m/s^{2}

= 49 N