Question

What are examples of ${{1}^{st}},{{2}^{nd}}and{{3}^{rd}}$ class levers?

Answer 1

We can define the lever as the basic machine because it reduces effort to do work. That is, a lever can amplify the input force. Thus a larger force applies at the output. There are three classes of levers. If the fulcrum is in the middle it is a first class lever. If the load is between the force applied and the fulcrum it is called a second class lever. Whereas if the effort is in the middle it is a third class lever.

Complete step-by-step solution:
A lever normally works by an effort applied at the particular point in which we want to move the load to another point through a balance point. And the balance point is called fulcrum. The three points effort, the load and fulcrum distinguishes the type of lever whether it is ${{1}^{st}},{{2}^{nd}}and{{3}^{rd}}$class levers.
If the fulcrum is between force and load is called the first class levers. That is, the fulcrum is in the middle in the case of a first class lever. In the case of first class levers the force moves a large distance in order to move the load to a small distance.
If the load is between the force applied and the fulcrum it is called a second class lever. Here the load is in the middle. As the force arm length to load increases, the mechanical advantage also increases.
If the effort is between the load and fulcrum it is called third class levers. Whereas the effort is in the middle of a third class lever. And when the load moves then the mechanical advantage will be low.

Note: We can define the lever as the basic machine because it reduces effort to do work. That is, a lever can amplify the input force. Thus a larger force applies at the output. This force provided on the lever is called leverage. The levels are in various applications of force.