Crowbar as a lever

Crowbar – One of the simplest kinds of lever is the crowbar, which is a class 1 lever.

We use a crowbar to lift very heavy objects off the ground.

The fulcrum of the crowbar is in between the effort and the load. The distance between fulcrum and effort(force applied) is called the effort arm, and the distance between fulcrum and load is known as the load arm.

The longer the crowbar is, the more the force can be magnified at the other end, if effort arm>load arm.

In other words, the effort arm has to be longer than the load arm, to get the Mechanical Advantage >1.

For further study, read this post on Mechanical Advantage. Also, read about the types of levers.