_____ friction is friction between moving surfaces.

Explanation

To solve the question about the type of friction that occurs between moving surfaces, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is a force that opposes the relative motion between two surfaces in contact. It can occur in different forms depending on the state of motion of the surfaces.

2. **Identifying Types of Friction**: There are two main types of friction:
- **Static Friction**: This occurs when two surfaces are in contact but not moving relative to each other.
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