Which of the following will produce the maximum friction ?

Options

A. rubbing of sand paper on glazed paper
B. rubbing of sand paper on glass table top
C. rubbing of sand paper on aluminium frame
D. rubbing of sand paper on sand paper

Answer

To determine which option produces the maximum friction, we need to analyze the surfaces involved in each option and their roughness. Friction is caused by the interlocking of irregularities between two surfaces, and the rougher the surfaces, the greater the friction.

### Step-by-Step Solution:

1. **Understand Friction**:
- Friction is a force that opposes the relative motion of two surfaces in contact. It is caused by the interlocking of microscopic irregularities on the surfaces.

2. **Identify the Options**:
- We have four options:
1. Rubbing of sandpaper on glazed paper
2. Rubbing of sandpaper on a glass tabletop
3. Rubbing of sandpaper on an aluminum frame
4. Rubbing of sandpaper on sandpaper

3. **Analyze Each Option**:
- **Option 1**: Sandpaper on glazed paper
- Glazed paper has a smooth surface, but sandpaper is rough. The interaction will produce significant friction due to the roughness of the sandpaper.
- **Option 2**: Sandpaper on glass tabletop
- Glass is also a smooth surface. The rough sandpaper will create friction, but less than when sandpaper is rubbed against another rough surface.
- **Option 3**: Sandpaper on aluminum frame
- Aluminum has a relatively smooth surface, similar to glass. The friction produced will be moderate.
- **Option 4**: Sandpaper on sandpaper
- Both surfaces are rough, leading to a high degree of interlocking and thus maximum friction.

4. **Compare the Friction Levels**:
- The roughness of the surfaces plays a crucial role in determining the amount of friction. Rubbing sandpaper against another piece of sandpaper will create the most interlocking irregularities, resulting in the highest friction.

5. **Conclusion**:
- Among the options, rubbing sandpaper on sandpaper (Option 4) will produce the maximum friction due to the roughness of both surfaces.

### Final Answer:
The option that produces the maximum friction is **Option 4: Rubbing of sandpaper on sandpaper**.