**Kinetic Friction Formula**

We witness in our day-to-day life the frictional force taking place in moving bodies which are in interaction. This is called kinetic friction. Rolling friction and sliding friction falls under this topic*.*

The Retarding force witnessed in the two moving planes when they are in interaction with each other is termed as Kinetic Friction. Kinetic Friction Formula is articulated as:

Where,

the coefficient of kinetic friction is μk ,

the normal force is F_{n}

Kinetic friction formula is handy for questions to compute the friction amid the bodies which are in motion.

**Kinetic Friction Solved Examples**

Underneath are problems on kinetic friction which may be useful to you.

**Problem 1: **A boy is playing with football. Compute the kinetic friction if the friction coefficient is 0.5 and is kicked with the force of 150 N?

**Answer:**

Given:

Coefficient of friction μk = 0.5,

Normal force F_{n} = 150 N,

The Kinetic friction is articulated by F_{k} = μk F_{n}

= 0.5 × 150

= 75 N.

**Problem 2: **A car is traveling at a uniform speed with normal force of 1000 N. If the kinetic friction applied on the car is 500 N. Compute the coefficient of kinetic friction?

**Answer:**

Known:

Normal force Fn = 1000 N,

Kinetic friction F_{k} = 500 N,

The coefficient of kinetic energy is given by

=0.5