The image above represents co-efficient allowing for friction.

To compute for co-efficient allowing for friction, two essential parameters are needed and these parameters are **Friction ****Co-efficient of the Gating System (μ _{1})** and

**Friction**

**Co-efficient of the Mould (μ**

_{2}).The formula for calculating co-efficient allowing for friction:

μ = μ_{1} x μ_{2}

Where:

μ = Co-efficient allowing for Friction

μ_{1} = Friction Co-efficient of the Gating System

μ_{2} = Friction Co-efficient of the Mould

Let’s solve an example;

Find the co-efficient allowing for friction when the friction co-efficient of the gating system is 10 and the friction co-efficient of the mould is 14.

This implies that;

μ_{1} = Friction Co-efficient of the Gating System = 10

μ_{2} = Friction Co-efficient of the Mould = 14

μ = μ_{1} x μ_{2}

μ = 10 x 14

μ = 140

Therefore, the **co-efficient allowing for friction** is **140.**

**Calculating the Friction Co-efficient of the Gating System when the Co-efficient Allowing for Friction and the Friction Co-efficient of the Mould is Given.**

μ_{1} = ^{μ} / _{μ}_{2}

Where;

μ_{1} = Friction Co-efficient of the Gating System

μ = Co-efficient allowing for Friction

μ_{2} = Friction Co-efficient of the Mould

Let’s solve an example;

Find the friction co-efficient of the gating system when the co-efficient allowing for friction is 45 and the friction co-efficient of the mould is 15.

This implies that;

μ = Co-efficient allowing for Friction – 45

μ_{2} = Friction Co-efficient of the Mould = 15

μ_{1} = ^{μ} / _{μ}_{2}

μ_{1} = ^{45} / _{15}

μ_{1} = 3

Therefore, the **friction co-efficient of the gating system **is **3.**

**Calculating the Friction Co-efficient of the Mould when the Co-efficient Allowing for Friction and the Friction Co-efficient of the Gating System is Given.**

μ_{2} = ^{μ} / _{μ}_{1}

Where;

μ_{2} = Friction Co-efficient of the Mould

μ = Co-efficient allowing for Friction

μ_{1} = Friction Co-efficient of the Gating System

Let’s solve an example;

Find the friction co-efficient of the mould when the co-efficient allowing for friction is 50 and the friction co-efficient of the gating system is 25.

This implies that;

μ = Co-efficient allowing for Friction = 50

μ1 = Friction Co-efficient of the Gating System = 25

μ_{2} = ^{μ} / _{μ}_{1}

μ_{2} = ^{50} / _{25}

μ_{2} = 2

Therefore, the **friction co-efficient of the mould **is **2.**