Which type of surface produce least friction ?

Options

A. Smooth surface
B. Rough surface
C. hard and rough surface
D. Both B and C

Answer

To determine which type of surface produces the least friction, we can analyze the characteristics of different surfaces and how they affect friction.

### Step-by-Step Solution:

1. **Understanding Friction**:
- Friction is a force that opposes the motion of an object. It acts in the opposite direction to the movement of the object.

2. **Types of Surfaces**:
- There are primarily two types of surfaces to consider: smooth surfaces and rough surfaces.
- Smooth surfaces have a very fine texture, while rough surfaces have a coarse texture.

3. **Coefficient of Friction**:
- The frictional force can be calculated using the formula:
\[ F_{\text{friction}} = \mu \times N \]
where \( F_{\text{friction}} \) is the frictional force, \( \mu \) is the coefficient of friction, and \( N \) is the normal force acting on the object.
- The coefficient of friction (\( \mu \)) varies depending on the surface texture.

4. **Friction on Smooth Surfaces**:
- On a smooth surface, the coefficient of friction (\( \mu \)) is very low, often tending towards zero.
- This means that the opposing force due to friction is minimal, allowing objects to move more freely.

5. **Friction on Rough Surfaces**:
- In contrast, rough surfaces have a higher coefficient of friction, which means they produce more frictional force.
- This increased friction opposes the motion more significantly, making it harder for objects to slide over rough surfaces.

6. **Conclusion**:
- Since smooth surfaces have a lower coefficient of friction compared to rough surfaces, they produce the least friction.
- Therefore, the type of surface that produces the least friction is a **smooth surface**.

### Final Answer:
The type of surface that produces the least friction is a **smooth surface**.

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