A VALVE controls the flow of fluids or gases. , A LEVER is used to produce movement, it can be pulled and pushed., A HINGE is used on a door and allows the door to move freely., Both A COG is used in gear systems and has teeth around their edges. , A GASKET provides a seal between two surfaces to prevent leaks of fluid or gas., A FUSE BOX is a container that holds several fuses.,  A FUSE is used in electrical circuits to prevent excessive current from overheating the wires., A LATCH keeps a door fastened., RIVETS are used in construction; for example, to join metal structures., A CRANK is used to produce movement. It moves in circles..

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