Answer the question briefly and the point:
Friction is a non-conservative force. Why?

Explanation

**Step-by-Step Solution:**

1. **Definition of Conservative and Non-Conservative Forces:**
- A conservative force is one where the work done by the force is independent of the path taken and depends only on the initial and final positions. In contrast, a non-conservative force is one where the work done depends on the path taken.

2. **Understanding Friction:**
- Friction is a force that opposes the relative motion between two surfaces in contact. It acts in the opposite direction to the movement of the object.

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