Ball bearings reduce friction because they ____ rather than slide.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how ball bearings reduce friction. To answer this, we need to understand the difference between sliding and rolling friction.

2. **Types of Friction**: There are two main types of friction to consider:
- **Sliding Friction**: This occurs when two surfaces slide against each other. It generally has a higher resistance.
- **Rolling Friction**: This occurs when an object rolls over a surface. It has a lower resistance compared to sliding friction.

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