The total force exerted by a body normal to the surface is called

Options

A. pressure
B. thrust
C. force of gravity
D. none of these

Explanation

To solve the question, we need to identify what the total force exerted by a body normal to the surface is called. Let's analyze the options given:

1. **Pressure**
2. **Thrust**
3. **Force of Gravity**
4. **None of these**

### Step-by-Step Solution:

**Step 1: Understand the Terms**
- **Normal Force**: This is the force exerted by a surface that supports the weight of an object resting on it. It acts perpendicular (normal) to the surface.
- **Pressure**: This is defined as the force exerted per unit area. It is calculated using the formula:
\[ \text{Pressure} = \frac{\text{Force}}{\text{Area}} \]
- **Thrust**: This is the total force exerted by a body normal to the surface. It is essentially the same as the normal force.
- **Force of Gravity**: This is the weight of the object, which acts downwards towards the center of the Earth.

**Step 2: Analyze the Question**
The question specifically asks for the total force exerted by a body normal to the surface.

**Step 3: Evaluate the Options**
- **Pressure**: This is not the answer because pressure is a measure of force per unit area, not the total force itself.
- **Thrust**: This is the correct answer because thrust refers to the total force exerted by a body normal to the surface.
- **Force of Gravity**: This is not the answer because it refers to the weight of the object, which is not necessarily normal to the surface unless specified.
- **None of these**: This option is incorrect since we have identified the correct term.

**Step 4: Conclusion**
The total force exerted by a body normal to the surface is called **Thrust**.

### Final Answer:
**Thrust**