First class levers are like see-saws. The fulcrum (turning point) comes between the effort and the load. So if you push down on the effort the load goes up. With second class levers the load comes between the effort and the fulcrum. This is good for catapulting things. Third class levers have the effort between the load and the fulcrum. An example would be a fishing rod. The fish on the end is the load, your hand on the rod is the effort and the hand at the end is the fulcrum.
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The examples of levers of second class are :--A bottle openerOrange squeezeretc.wheelbarrowdoornutcracker
A claw hammer is a lever when using the claw to pull a nail. A crowbar or pry bar is also a lever. Automobile friction jacks are also levers. Your arm is a biological (biomechanical) lever.
1 wheel barrel 2 dolly 3 trailer 4 stapler 5 bottle opener 6 nut cracker 7 wrench 8 hole puncher 9 Achilles tendon 10 can opener
3-D Printer Computer Gunpowder Paper Printing Press Waffle Cone
Class 1.