What happens when there is no friction between the chalk and the blackboard?

Explanation

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is the force that opposes the relative motion of two surfaces in contact. It is essential for many everyday activities, including writing on a blackboard.

2. **Role of Friction in Writing**: When you write with chalk on a blackboard, friction between the chalk and the board allows the chalk to leave a mark. The rough surface of the blackboard interacts with the chalk, enabling it to deposit particles onto the board.

3. **Absence of Friction**: If there is no friction between the chalk and the blackboard, the chalk will not be able to adhere to the surface of the board. This means that when you try to write, the chalk will simply slide over the surface without leaving any residue.

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