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Crowbar for removing nails Seesaw pliers human upper arm scissors wheelbarrow spade nutcracker baseball bat The three classes of levers There are three classes of levers depending on the location of the fulcrum, the effort force and load or resistance force. First-class levers Effort Force Load A First-Class Lever is a lever in which the fulcrum is located in between the Effort Force and the Resistance Force or Load. Examples: 1. 2. 3. 4. Seesaw (also known as a teeter-totter) Crowbar (removing nails) Pliers Scissors Load Second-class levers Examples: 1. Wheelbarrow 2. Nutcracker 3. door Effort Force Load Third-class levers Examples: 1. 2. 3. 4. 5. 6. 7. 8. Effort Force Human arm Tongs Catapult fishing rod Many garden tools, such as a hoe A baseball bat A shovel A broom A mnemonic for remembering the three classes of levers is the word where the letters fle-x, f-l-e represent the fulcrum, the load, and the effort as being between the other two, in the first-class lever, the second-class lever, F L and the third-class lever. E In our models, the fulcrum was the orange triangle, the effort force is the green arrow and the load or resistance force is the gray box.