Choose the correct option for each question. There is only correct response for each question.
Rolling friction is smaller than

Options

A. Sliding friction
B. Static friction
C. fluid friction
D. All of the above

Answer

To solve the question, "Rolling friction is smaller than," we need to analyze the different types of friction and their characteristics.

### Step-by-Step Solution:

1. **Understand the Types of Friction**:
- There are several types of friction: static friction, sliding (kinetic) friction, rolling friction, and fluid friction. Each type of friction has different characteristics and values.

2. **Define Rolling Friction**:
- Rolling friction occurs when an object rolls over a surface. It is generally less than sliding friction because the area of contact is minimal and the point of contact does not slide over the surface.

3. **Compare Rolling Friction with Other Frictions**:
- **Static Friction**: This is the friction that prevents an object from starting to move. It is generally higher than rolling friction.
- **Sliding Friction**: This is the friction acting on an object that is sliding over a surface. Sliding friction is typically greater than rolling friction because there is more surface area in contact and the surfaces are sliding against each other.
- **Fluid Friction**: This is the friction experienced by objects moving through a fluid (liquid or gas). Fluid friction is also generally greater than rolling friction.

4. **Conclusion**:
- Since rolling friction is less than static friction, sliding friction, and fluid friction, we can conclude that rolling friction is smaller than all these types of friction.

5. **Select the Correct Option**:
- Based on the analysis, the correct option is **D**: "Rolling friction is smaller than sliding friction, static friction, and fluid friction."