How many kinds of levers are there? How are they different from each other?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Levers**: Levers are simple machines that help lift or move loads with less effort. They consist of a rigid bar that pivots around a point called the fulcrum.

2. **Types of Levers**: There are three main types of levers, classified based on the arrangement of the fulcrum, load, and effort.

3. **Class 1 Lever**:
- **Arrangement**: In a Class 1 lever, the fulcrum is positioned between the load and the effort.
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