Identify what class of levers the following objects belong to. State if mechanical advantage of these objects is more than, equal to or less than one.
Nut cracker, pliers, fire tong, wheel barrow and scissors.

Explanation

To determine the class of levers for the given objects and their mechanical advantages, we will analyze each object step by step.

### Step 1: Identify the Class of Lever
Levers are classified into three classes based on the relative positions of the effort, load, and fulcrum.

1. **First Class Lever**: The fulcrum is between the effort and the load. (e.g., seesaw)
2. **Second Class Lever**: The load is between the fulcrum and the effort. (e.g., wheelbarrow)
3. **Third Class Lever**: The effort is between the fulcrum and the load. (e.g., tweezers)
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