What is a lever?

 
A lever is a rod or an arm that tilts around a fulcrum to make a useful motion. 

A lever can make work easier by making your force greater or changing the direction of your force.

There are three kinds of levers.

First Class Levers:

If the fulcrum is between the effort and the load, the lever is a first class lever.

A seesaw is a first class lever.  Scissors are two first class levers that are connected.

Second Class Levers:

If the load is between the fulcrum and the effort, it is a second class lever.

A wheelbarrow is an example of a second class lever.

Third Class Levers:

If the effort is between the fulcrum and the load, it is a third class lever.

A fishing pole and tweezers are examples of third class levers.

Real life examples of levers.