Mechanical Engineering - Machine Design - Discussion

Pair of tongs comes under 1st class of levers.

Pictures can make clear understanding.

A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. Many of our basic tools use levers, including scissors (2 class 1 levers), pliers (2 class 1 levers), hammer claws (a single class 2 lever), nut crackers (2 class 2 levers), and tongs (2 class 3 levers).

In a Type 1 Lever, the pivot (fulcrum) is between the effort and the load. In an off-center type one lever (like a pliers), the load is larger than the effort, but is moved through a smaller distance.

In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort.

In a Type 3 Lever, the effort is between the pivot (fulcrum) and the load.

What is mining of tongs?