The image above represents shear force or S waves.

To compute for shear force or S waves, two essential parameters are needed and these parameters are **Dynamic Modulus of Rigidity (G _{d}) **and

**Elasticity of Rock Mass (p).**

The formula for calculating shear force or S waves:

v_{s} = ^{√(Gd)} / _{p}

Where:

v_{s} = Shear Force or S Waves

G_{d} = Dynamic Modulus of Rigidity

p = Elasticity of Rock Mass

Let’s solve an example;

Find the shear force or s waves when the dynamic modulus of rigidity is 12 and the elasticity of rock mass is 28.

This implies that;

G_{d} = Dynamic Modulus of Rigidity = 12

p = Elasticity of Rock Mass = 28

v_{s} = ^{√(Gd)} / _{p}

v_{s} = ^{√(12)} / _{28}

v_{s} = ^{3.46} / _{28}

v_{s} = 0.12

Therefore, the **shear force or S waves **is **0.12.**

**Calculating the Dynamic Modulus of Rigidity when the Shear Force or S Waves and the Elasticity of Rock Mass is Given.**

G_{d} = (v_{s} x p)^{2}

Where:

G_{d} = Dynamic Modulus of Rigidity

v_{s} = Shear Force or S Waves

p = Elasticity of Rock Mass

Let’s solve an example;

Find the dynamic modulus of rigidity when the shear force or s waves is 21 and the elasticity of rock mass is 14.

This implies that;

v_{s} = Shear Force or S Waves = 21

p = Elasticity of Rock Mass = 14

G_{d} = (v_{s} x p)^{2}

G_{d} = (21 x 14)^{2}

G_{d} = (294)^{2}

G_{d} = 86436

Therefore, the **dynamic modulus of rigidity **is **86436.**

**Calculating the Elasticity of Rock Mass when the Shear Force or S Waves and the Dynamic Modulus of Rigidity is Given.**

p = ^{√(Gd)} / _{vs}

Where:

p = Elasticity of Rock Mass

v_{s} = Shear Force or S Waves

G_{d} = Dynamic Modulus of Rigidity

Let’s solve an example;

Find the elasticity of rock mass when the shear force or s waves is 24 and the dynamic modulus of rigidity is 10.

This implies that;

v_{s} = Shear Force or S Waves = 24

G_{d} = Dynamic Modulus of Rigidity = 10

p = ^{√(Gd)} / _{vs}

p = ^{√(10)} / _{24}

p = ^{3.16} / _{24}

p = 0.13

Therefore, the **elasticity of rock mass **is **0.13.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the shear force or S waves.

To get the answer and workings of the shear force or S waves using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 1,500 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Geology**** **under **Add-on.**

Now, Click on **Rock Mechanics**** **under **Geology**

Now, Click on **Shear Force or S Waves** under **Rock Mechanics**

The screenshot below displays the page or activity to enter your values, to get the answer for the shear force or S waves according to the respective parameters which are the **Dynamic Modulus of Rigidity (G _{d}) **and

**Elasticity of Rock Mass (p).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Dynamic Modulus of Rigidity (G _{d}) **is

**12**and

**Elasticity of Rock Mass (p)**is

**28**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the shear force or S waves and presents the formula, workings and steps too.