When a body slides over the surface of another body, the resistance to its motion is called :

Options

A. Rolling friction
B. Sliding friction
C. Fluid friction
D. Static friction

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the type of resistance encountered when one body slides over the surface of another body.

2. **Identifying the Types of Friction**: There are various types of friction, including:
- **Static Friction**: The friction that prevents motion when a body is at rest.
- **Sliding Friction**: The friction that acts on a body when it is sliding over another surface.
- **Rolling Friction**: The friction that occurs when an object rolls over a surface.
- **Fluid Friction**: The resistance encountered by an object moving through a fluid (liquid or gas).

3. **Analyzing the Scenario**: In the scenario described, a body is sliding over another surface. This indicates that the body is in motion relative to the surface it is sliding on.

4. **Choosing the Correct Type of Friction**: Since the question specifically mentions "sliding," we need to identify which type of friction corresponds to this action. The correct type of friction that resists the motion of a sliding body is **sliding friction**.

5. **Conclusion**: Therefore, the resistance to motion when a body slides over the surface of another body is called **sliding friction**.

**Final Answer**: Sliding friction.

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