The impact of force on a body depends on the amount of force that acts on a unit of a surface.

Options

A. pressure
B. force
C. area
D. density

Answer

To solve the question regarding the impact of force on a body and how it depends on the amount of force acting on a unit of surface, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Force and Pressure**:
- The impact of force on a body is related to how much force is applied over a specific area. This relationship is quantified by the concept of pressure.

2. **Defining Pressure**:
- Pressure (P) is defined as the force (F) applied per unit area (A). This can be mathematically expressed as:
\[ P = \frac{F}{A} \]
- Here, P is the pressure, F is the force applied, and A is the area over which the force is distributed.

3. **Identifying Units**:
- The SI unit of pressure is the pascal (Pa), which is equivalent to one newton per square meter (N/m²). This indicates that pressure measures how concentrated the force is over an area.

4. **Analyzing the Impact of Force**:
- The effect of a given force on an object depends not only on the magnitude of the force but also on the area over which it is applied. A larger area will result in lower pressure for the same amount of force, while a smaller area will result in higher pressure.

5. **Conclusion**:
- Therefore, we conclude that the impact of force on a body indeed depends on the amount of force acting on a unit of surface area, which is represented by the concept of pressure.

### Final Answer:
The impact of force on a body depends on the amount of force that acts on a unit of surface area, which is quantified by pressure (P = F/A).