Why do people slip on wet floors?

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 walking, standing, and holding onto surfaces.

2. **Effect of Water on Surfaces**: When a floor is wet, water molecules spread across the surface. This layer of water acts as a lubricant between the floor and the shoes.

3. **Reduced Interlocking of Surfaces**: On a dry floor, the surfaces of the floor and shoes interlock, creating a higher frictional force. However, when the floor is wet, the water molecules prevent the surfaces from interlocking effectively.

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