Which friction is greater, sliding or rolling?

Explanation

To determine which type of friction is greater, sliding friction or rolling friction, we can analyze the definitions and characteristics of both types of friction.

### Step-by-Step Solution:

1. **Define Sliding Friction**:
- Sliding friction occurs when one surface slides over another. This type of friction is experienced when two surfaces are in contact and one moves relative to the other.
- Example: Pushing a book across a table.

...