What is lever and what are three types of lever with examples

Dear Student
A lever is a simple machine. It consists of a rigid bar, which is capable of turning around a pivot, which is also called a fulcrum. Generally, we use a rod, which can rotate freely about the fulcrum.

There are three types of lever.
First class lever - It has the fulcrum in between the weight and the force applied. 

Example:

Our hand pushing an object or seesaws, crowbars.

Second Class Lever- It has the fulcrum is at one end and the force applied is on the other end. Weight is applied in middle.

Example:

​​​Wheelbarrow
​​​​​Nail clippers

Third Class Lever- It has the fulcrum is at one end and the force is applied in the middle and the weight is on the other end. 

Example:

Fishing rod

Human jaw

Regards