**Calculation of Pressure Exerted by a Force on a Wall**

**Given:**
- Force (F) = 12N
- Dimension of the wall:
- Length (l) = 12 cm
- Width (w) = 5 cm

**Formula:**
Pressure (P) = Force (F) / Area (A)

**Step 1: Calculate the Area of the Wall**
- Area (A) = Length (l) × Width (w)
- Area (A) = 12 cm × 5 cm = 60 cm²

**Step 2: Convert the Area to SI Units**
- 1 cm² = 0.0001 m² (conversion factor)
- Area (A) = 60 cm² × 0.0001 m²/cm² = 0.006 m²

**Step 3: Calculate the Pressure**
- Pressure (P) = Force (F) / Area (A)
- Pressure (P) = 12N / 0.006 m²
- Pressure (P) = 2000 Pa (Pascal)

**Explanation:**
Pressure is defined as the force applied per unit area. To calculate the pressure exerted by a force on a wall, we need to determine the area of the wall and divide the force by that area.

In this case, the force exerted on the wall is given as 12N. The dimensions of the wall are provided as 12 cm (length) and 5 cm (width).

To find the area of the wall, we multiply the length and width together.
Area (A) = 12 cm × 5 cm = 60 cm²

However, the SI unit for area is square meters (m²), so we need to convert the area from cm² to m². Since 1 cm² is equal to 0.0001 m², we multiply the area by this conversion factor.
Area (A) = 60 cm² × 0.0001 m²/cm² = 0.006 m²

Finally, we can calculate the pressure by dividing the force by the area.
Pressure (P) = 12N / 0.006 m² = 2000 Pa

Therefore, the pressure exerted by a force of 12N on a wall with dimensions 12 cm by 5 cm is 2000 Pa (Pascal).

0.20pa