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The workman uses a trolley to move the large packing case. The fulcrum is the wheel. First Class Lever
In a first-class lever the fulcrum is located at some point between the effort and resistance forces.
Common examples of first-class levers include crowbars, scissors, pliers, tin snips and seesaws.
Second Class Lever The gardener uses a wheel barrow to lift tools and garden waste. The load is in the centre of the barrow With a second-class lever, the load is located between the fulcrum and the effort force. Common examples of second-class levers include nut crackers, wheel barrows, doors, and bottle openers.
Third Class Lever The fisherman catches the fish which becomes the load at the end of the lever.
With a third-class lever, the effort force is applied between the fulcrum and the resistance force.
Examples of third-class levers include tweezers, hammers, and shovels.