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the lever has a sharp edge which works for cutting the paper and hence it is a wedge
Which has a greater input force a nail or a screw
Well, honey, a non-example of a screw would be a nail. They both hold things together, but a screw has those lovely threads that twist into materials, while a nail just gets hammered in like it's nobody's business. So, next time you're looking for a non-example of a screw, just think of a good ol' nail.
to cut through things. a ship cuts through the water like a nail or ax cuts through wood.
The sharp point tends to work as a wedge and move the fibers off to the side. A blunt nail has to cut the fibers in order to go into the wood. This is because of pressure.