______is friction that acts on objects when they are rolling over a surface. This is much weaker than sliding friction

Options

A. Rolling friction
B. Static friction
C. Sliding friction
D. Fluid friction

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the type of friction that acts on objects when they are rolling over a surface.

2. **Identifying Types of Friction**: We need to consider the different types of friction:
- **Static Friction**: This acts on stationary objects that are not moving.
- **Sliding Friction**: This occurs when two surfaces slide against each other.
- **Rolling Friction**: This is the friction that acts on rolling objects.
- **Fluid Friction**: This occurs when an object moves through a fluid (liquid or gas).

3. **Eliminating Incorrect Options**:
- **Fluid Friction**: This is not applicable here since we are discussing objects rolling on surfaces, not moving through fluids.
- **Sliding Friction**: This is also not applicable because it refers to objects sliding over a surface, not rolling.
- **Static Friction**: This is relevant for stationary objects, so it does not apply to rolling objects.

4. **Identifying the Correct Answer**: The only type of friction that applies to rolling objects is **Rolling Friction**. This type of friction is generally weaker than sliding friction because it involves less surface area in contact and allows for easier movement.

5. **Final Answer**: The correct answer to fill in the blank is **Rolling Friction**.

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