Explanation:
Simple machines make our work easier. There are many types of simple machines.
(1) Seesaw is an example of a first-class lever. In the first class lever, the fulcrum is present in the middle of the lever.
(2) Pencil sharper: It is a compound machine. It consists of wheel and axle and wedge also.
(3) Bottle opener: It is a type of 2nd class lever. In this, the fulcrum is present at one end.
(4) Forearm: It is an example of a third-class lever. Fulcrum is present at one end in the third class lever.
(5) Nail: It is an example of the wedge as all knives or nails are wedges.