Types of Levers
May 2016 - All levers fall into one of three types of lever.
A first-class lever is a stick where the fulcrum is between the weight and the energy moving the weight (your hands, for example). Some common first-class levers are see-saws, crowbars, pliers, scissors (which use two first-class levers together), and a hammer pulling a nail.
A second-class lever is a stick where the fulcrum is at one end of the stick, you push on the other end, and the weight is in the middle of the stick. Some common second-class levers are doors, staplers, wheelbarrows, and can openers.
A third-class lever is a stick where the fulcrum is at one end of the stick, you push on the middle, and the weight is at the other end of the stick. With a third-class lever, you have to put in more energy than you would just lifting the weight, but you get the weight to move a longer distance in return. Some common examples are a broom, a hoe, a fishing rod, a baseball bat, and our own human arms.
Learn by doing: Find examples of each kind of lever that aren't mentioned here
More about simple machines
Levers in kits - build your own levers
Advanced lever kit lets you build many different kinds of levers.
A less complicated lever kit - only eight different kinds of levers: balance scale, wheelbarrow, etc.