Define mechanical advantage of a lever.

Explanation

### Step-by-Step Solution

1. **Understanding the Concept of a Lever**:
A lever is a simple machine that consists of a rigid bar that can rotate around a fixed point called the fulcrum. It is used to lift or move loads with less effort.

2. **Identifying Components of a Lever**:
In a lever system, there are three main components:
- **Load (F2)**: The weight or resistance that needs to be moved.
...