A wedge.
A nail is a simple machine. :DDD i learned that in tech today.
lever
A train is not a simple machine.
eh
A compound machine.
Lever
a nail is a wedge
You are using a lever when you pull a nail with a hammer or bar.
A nail is a simple machine. :DDD i learned that in tech today.
A wedge
A hook isn't really a "machine" at all. Depending on its construction, in a particular application it might be operating as a lever, or possibly as an inclined plane, but it's really not possible to say with any certainty what kind of simple machine it is without more details of exactly what the hook is doing. It may not be any kind of simple machine.
If you mean its classification, its a wedge.
A pulley isn't a kind of simple machine, it is a simple machine
a hammer
lever
A train is not a simple machine.
the claw