How can we understand the phenomenon of frictional electricity?

Explanation

### Step-by-Step Solution:

1. **Understanding Friction**:
- Friction is defined as the resistance encountered when one surface rubs against another. It occurs due to the interactions between the surfaces of the two materials.

2. **Understanding Electricity**:
- Electricity refers to the presence and flow of electric charge. When a substance gains or loses electrons, it becomes charged. This process can occur through various means, including friction.

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